“The soldier wrote a beautiful poem about the countryside”
I believe the correct answer is c
It might be said that the correct sentences is C <span> "She is the person whom he had found sleeping in the library". This is because whom is correctly used.
In the case of A</span><span> and B, They are incorrect because instead of who it should have been whom, the correct pronoun.
On the contrary; sentence D should be who instead of whom. </span>
A. Yesterday, Leo had a __more difficult__ time sleeping than today.
B. is incorrect because it is incorrect to say one has "a difficultly time" doing anything; you have "a difficult time" doing something.
C. is incorrect because you can not say "most" when comparing something to something else; you can either say "It was the MOST difficult" or "It was MORE difficult than that."
