Answer:
A.
Step-by-step explanation:
I included two pictures that I found that show the duration of each note and rest. If you use your knowledge of the duration of notes (or these pictures), you can see that you need either 4 quarter notes (or quarter rests) or 8 eighth notes (or eighth rests) to have 4 beats in one measure.
You can use the images I provided to help you count out the total number of beats in each measure. Each option uses a variety of eighth rests, eighth notes, and quarter notes.
When you count the number of beats in Option B, there are only 3 beats in each measure.
When you count the number of beats in Option C, there are only 2 beats in each measure.
When you count the number of beats in Option A, there ARE 4 beats in each measure.
Option D is clearly not the answer.
If you need more help or further explanation, let me know and I would be happy to help! I hope this helps!! Have a lovely day!!! :)