Multiple choice english question, grade 7? Please help?

"Some idioms are also clich�s, which we introduced earlier as a word, phrase or concept that has been used so often that it has lost its impact. It is important to note that while idioms are usually clich�s, not all clich�s are idioms. The difference is that idioms use figurative language to communicate while clich�s are merely commonly used words, phrases or concepts."