The third one, One hero in the animation field is Mel Blanc the voice behind many cartoon characters. needs a comma after "mel blanc" because its an essential appositive and its a noun. if it were correct it would say "One hero in the animation field is Mel Blanc, the voice behind many cartoon characters."
The correct answer is B) To inform. Hope this helps.
The bus “fare” is twenty-five cents higher than last month.
