Criticism and self-criticism _____ necessary _____ it helps us to correct mistakes.

A. is, in that     B. are, in that    C. is, in which  D. are, at that

Criticism and self-criticism _____ necessary _____ it helps us to correct mistakes.

    A. is, in that     B. are, in that    C. is, in which  D. are, at that

Criticism and self-criticism ______ necessary ______ it helps us to correct mistakes.

1. A.
   is, in that
2. B.
   are, in that
3. C.
   is, in which
4. D.
   are, at that

Criticism and self-criticism _____ necessary _____ it helps us to correct mistakes.

Criticism and self-criticism _____ necessary _____ it helps us to correct mistakes.