Tension is a feeling. Suspense is anxiously waiting for something to happen. You can feel tense without waiting for something to happen — such as when you are simply uneasy or nervous but you don't know why — but you can't be anxiously waiting for something to happen without feeling tense.
If I were to awnser this I would of chose c because if the mother is comparing the rock to her courage it means she doesn’t need the courage anymore it’s like she already has it.
