Question

Which verb best completes the sentence?

Under her bed __________ a box of pictures she had not yet put into albums.

A.
is

B.
are

C.
were

i think "were"

Answer 1

I'm thinking

Answer 2

A. Is Hope it Helped :)

Answer 3

pretty sure is A

Answer 4

If you get rid of the extra phrases, the sentence will be simpler and it should be easier to tell what word to use.
Under her bed ____ a box.
Putting the subject first might make this even easier: A box ____ under her bed.