Final answer:
Noah took 3 pictures of chipmunks and 5 pictures of birds, which adds up to 8 pictures in total. The correct answer is A. 8.
Step-by-step explanation:
The subject of the question is Mathematics, specifically addition within the category of basic arithmetic. To determine how many pictures Noah took in all, we simply add the number of pictures of chipmunks to the number of pictures of birds. Noah takes 3 pictures of chipmunks and 5 pictures of birds.
3 pictures of chipmunks + 5 pictures of birds = 8 pictures in total.
Therefore, the answer is A. 8.