Answer:
We can see that the graph of y = cos(x) has been shifted up 2 units. This means that we need to add 3 to the function cos(x) after it has already outputted (i.e. don't add 3 within the cosine input):
A) y = cos(x) + 2
Further Note
The range of an untranslated sine or cosine graph is -1 ≤ y ≤ 1. The range of this graph is:
1 ≤ y ≤ 3
We can see that these ranges differ by 2.
