To identify the note played on the second beat of the second measure, let's break down the measures described:
- Measure 1: Quarter rest followed by a quarter note A4.
- Measure 2: Quarter notes B4 and A4.
- The first quarter note is B4 (on the first beat).
- The second quarter note (on the second beat) is A4.
Therefore, the note being played on the second beat of the second measure is A4.
Now, looking at the options provided (A, A, B, B, C, C, D), it appears we should choose according to the specified response format. If "A" corresponds to the note A4, that would be the correct choice.
Given that "A" is listed twice, you could either select A or A as your final response. So, the answer is definitely A.