C is your right answer hope it helped
To explain an idea or event, or to provide information
Well the sentence in front of the colon has to be a full sentence so your answer is D. I live my life by this motto: "Live life to the fullest." because "I live my life by this motto" is a sentence and is about to bring up the motto <span>"Live life to the fullest."
Hoped I helped!</span>
The answer is c. I am sure