C. setence fragment, because we do not know who is doing the action.
Answer:
use this app
Explanation:
https://math.he.net/?gclid=EAIaIQobChMIhrDMibyZ7wIVzj8BCh3x1Q6NEAEYASAAEgIsA_D_BwE
<span>They'll / do great things if they're willing to dig</span>