The correct answer is: A. Why wasn’t the matter brought to my notice?
The other options are incorrect because they use the present tense, which is not appropriate for a question about something that happened in the past.
Option B: Why isn’t the matter brought to my notice?
This option uses the present tense, which is not appropriate for a question about something that happened in the past. The matter was brought to your notice in the past, so the correct tense to use is the past tense.
Option C: Why wasn’t the matter brought by you to my notice?
This option is also incorrect because it uses the passive voice. The passive voice is often used to avoid assigning blame, but in this case it is important to know who was responsible for bringing the matter to your notice. The correct option should use the active voice and specify who was responsible.
Option D: Why isn’t the matter brought by you to my notice?
This option is also incorrect because it uses the present tense, which is not appropriate for a question about something that happened in the past. The matter was brought to your notice in the past, so the correct tense to use is the past tense.
In conclusion, the correct answer is: A. Why wasn’t the matter brought to my notice?