Topic: Adjective (বিশেষণ),

Best Answer Explained in Below-:

The correct answer to the prompt "Please be __ when you cross this road" is B) careful. This choice is appropriate because it conveys the need for caution and attentiveness in a potentially hazardous situation, such as crossing a road. When crossing, individuals must be aware of their surroundings, including traffic, pedestrians, and signals, to ensure their safety.

Option A) "careless" is the opposite of careful and suggests a lack of concern or attention to danger, which is not advisable when crossing a busy road.

Option C) "carefree" implies a state of being free from worries or responsibilities, which can be dangerous in a situation that requires alertness, such as navigating traffic.

Option D) "caring" refers to showing kindness or concern for others, but it does not directly relate to the actions needed when crossing a road.

In summary, "careful" is the only option that directly emphasizes the importance of being vigilant and cautious in the context of road safety, making it the most suitable choice for completing the sentence.