Why Do Plants Use Cotransporters Instead of Ion Channels to Transfer

Why do plants use cotransporters instead of ion channels to transfer anions into cells?

A) Cotransporters are able to transfer anions against the membrane potential gradient,but ion channels cannot.
B) Cotransporters are able to transfer anions against the concentration gradient,but ion channels cannot.
C) Cotransporters are able to transfer anions against the proton gradient,but ion channels cannot.
D) Anions are too bulky to be transported by ion channels.