I think the confusion is between B and E, rest of the options have Subject-Verb agreement issue.
The only difference between B and E is the use of "us" vs "ourselves". Now words such as ourselves, himself, myself and itself are called reflexive pronouns. These words are used if the object(s) and the subject(s) refer to the same person(s) or thing(s). Forexample
I can only blameme for my failures. - Incorrect
I can only blamemyself for my failures. - Correct
...
The only difference between B and E is the use of "us" vs "ourselves". Now words such as ourselves, himself, myself and itself are called reflexive pronouns. These words are used if the object(s) and the subject(s) refer to the same person(s) or thing(s). Forexample
I can only blameme for my failures. - Incorrect
I can only blamemyself for my failures. - Correct
...
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