Step 1: Understanding the meaning of "conviction."
- "Conviction" refers to a firmly held belief.
Step 2: Eliminating incorrect options.
- (A) Persuasion refers to convincing others, not personal belief.
- (B) Disbelief is the opposite of conviction.
- (D) Ignorance refers to lack of knowledge, which is unrelated.
Step 3: Confirming the correct answer.
- (C) Strong belief correctly defines conviction.
Thus, the correct answer is (C).