The tibialis anterior muscle dorsiflexes the foot at the ankle and also assists in

The tibialis anterior muscle dorsiflexes the foot at the ankle and also assists in inversion of the foot.  The tibialis anterior is a muscle that originates in the upper two-thirds of the lateral surface of the tibia and inserts into the medical cuneiform and first metatarsal bones of the foot, it acts as dorsiflex and invert the foot. 

Iam not sure but to me it with be a or dsorry if i was late! hope this ! : )if you really want me to find out the answer that is correct tell me and i will do more research but the a or d makes sense to me.