Meaning: 'Tracking' means to monitor or follow the progress of something, in this case, the person's health metrics.

Wrong options:

• transfering: 'Transfering' implies moving information from one place to another, which does not accurately describe the watch's function of monitoring health data.
• modifying: 'Modifying' suggests changing something, which is not relevant to the act of monitoring health information.
• unveiling: 'Unveiling' means to reveal or disclose, which does not fit the context of continuous monitoring.

Correct answer: detects

Explanation: The word 'detects' is the correct verb form that indicates the action of noticing or discovering a change in health. It fits grammatically in the present tense and contextually describes the watch's ability to sense changes.

Meaning: 'Detects' means to discover or identify the presence of something, such as a change in health.

Wrong options:

• defines: 'Defines' means to state the meaning of something, which does not apply to the action of noticing changes in health.
• varies: 'Varies' suggests a change in different forms or types, which does not accurately describe the watch's function of sensing health changes.
• reflects: 'Reflects' means to show or demonstrate, which does not fit the context of actively sensing changes.

Correct answer: located

Explanation: The word 'located' is an adjective that describes the hub's position in the home. It fits grammatically and contextually, indicating where the touchscreen hub is situated.

Meaning: 'Located' means to be situated in a particular place, referring to the hub's position in the home.

Wrong options:

• restored: 'Restored' implies bringing something back to a previous state, which does not fit the context of describing the hub's position.
• scattered: 'Scattered' means spread out over a wide area, which contradicts the idea of a specific location for the hub.
• summoned: 'Summoned' means to call upon, which does not describe the physical position of the hub.

Correct answer: alerts

Explanation: The word 'alerts' is the correct verb that indicates the action of notifying contacts. It fits grammatically in the present tense and contextually describes the function of the hub in communicating with pre-determined contacts.

Meaning: 'Alerts' means to notify or warn someone about something, in this case, calling for help.

Wrong options:

• suppresses: 'Suppresses' means to put an end to something, which does not fit the context of notifying contacts for help.
• collects: 'Collects' implies gathering information, which does not accurately describe the action of notifying contacts.
• stimulates: 'Stimulates' means to encourage or provoke a response, which does not fit the context of alerting contacts.