Topic: Sentence (বাক্য),

Best Answer Explained in Below-:

The correct answer is option D, "When does mother usually worry?" because it directly restates the original question. The purpose of the options is to provide alternative inquiries that are either related or relevant to the original question.

Option A, "Does he usually worry?" shifts the focus entirely from 'mother' to 'he', which changes the subject and does not provide any relevant information pertaining to the initial inquiry about a mother's worries.

Option B, "When does father usually worry?" is similar in that it changes the subject from 'mother' to 'father', again failing to address the original question regarding maternal concerns.

Option C, "How does mother worry?" modifies the question from the timing of worries to the manner in which those worries are expressed, diverging from the original intent.

Therefore, option D remains the only choice that maintains the same subject and context as the question posed, allowing for a coherent and accurate reflection of the initial inquiry about when a mother typically experiences worry. This adherence to the original question’s focus makes option D the only appropriate answer.