What does the word conviction mean in this sentence?

His voice rang with great conviction as he told us his ideas.
A)Anger
B)Certainty
C)Confusion
D)Sorrow

Have you looked up conviction in a dictionary?

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http://dictionary.reference.com/browse/conviction?s=t

See definition #1. Which of those words means the same thing.

Yes

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You're welcome.

The word "conviction" in this sentence means certainty. To determine the meaning of a word, it is helpful to look at the context in which it is used. In this case, the sentence mentions that the person's voice "rang with great conviction," suggesting a strong and confident tone. This indicates that the person was confident and certain about the ideas they were expressing. Therefore, the correct answer is B) Certainty.