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Option 4: "In the 14th century"
Explanation: The text clearly states that in the 14th century, English merchants were obliged to have signs outside their shops, making this the correct answer. This aligns directly with the question about when signs became compulsory.
Option 1: "In the Middle Ages"
Explanation: While signs became more common during the Middle Ages, the text specifies that it was in the 14th century when English merchants were obliged to have signs outside their shops. Therefore, this option is too broad and does not pinpoint the exact time when it became compulsory.
Option 2: "During the Roman occupation of Britain"
Explanation: The text mentions that signs were introduced into Britain by the Romans, but it does not state that they were compulsory at that time. This option misrepresents the information by suggesting that signs were mandatory during the Roman period.
Option 3: "In the 17th century"
Explanation: The 17th century is mentioned in the context of a law requiring shopkeepers to mount their signs flat against the wall due to accidents, but it does not indicate that signs became compulsory at that time. This option misinterprets the timeline presented in the text.
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