C is the declarative sentence.
Personally, I would phrase it like this:
The choir moved the audience to tears with their beautiful voices.
It helps the bird to reach food in hard to get to places.
The third statement is true.
Synonyms are words that are the same or similar to the word. If you don’t know a word, but you know what it’s synonym means, then you know what the word means.
Synonyms can help you determine the meaning of an unfamiliar word because they have the same meaning as the word