Final answer:
The question involves a communication issue where a valid hint wasn't understood, likely due to the recipient's limited comprehension abilities, despite being able to use basic language and gestures. The correct option is B. Lack of comprehension.
Step-by-step explanation:
The scenario described suggests a communication issue where a person named John gave a hint, but the recipient could not understand it. Considering the context provided, it seems that the person who received the hint was capable of using basic forms of communication, such as gestures and simple words like "yes" and "no," but may have had difficulties with more complex or nuanced forms of communication.
The fact that the hint was described as valid implies that the problem was not with the quality of the hint itself but rather with the recipient's ability to comprehend it. This points to B. Lack of comprehension as the issue. The recipient may not have had the necessary background, context, or knowledge to understand the hint, despite being able to communicate at a basic level.
Therefore, given the information that the person understood only signs and basic language, but the hint was still valid, it suggests that the obstacle in understanding the hint was not due to its quality but due to the recipient's limited understanding. Hence, the correct option is B. Lack of comprehension.