Please select the choice that corrects any error in the use of apostrophes.?

Question

1. Why do the writings from those times use so many strange f 's?

writings'

time's

f

no change

2. Oh, no, there's a month's worth of photographs in my digital camera!

Theirs

months

photographs'

no change

3. The stacks on the left are yours'; the ones on the right are ours.

stacks'

yours

ours'

no change

Answer 1

1. no change

2. no change (debatable)

3. yours

Answer 2

no change

no change

yours

Answer 3

1.  no change

2.  no change as listed, but you have an error in the beginning of the sentence.  Using that type of interjection, it should read:  Oh no!  There's a month...

3.  yours

Extra one: sports; for instance,