Bui Wants to Condition His Lab Rat to Fear Drinking

Bui wants to condition his lab rat to fear drinking orange-flavored water. He pairs a mild shock with the drinking of flavored water. He wants the rat to associate the unconditioned stimulus, the shock, with drinking the water. How could he be most successful?

A) Raise the shock to as strong as he can.
B) Choose a different neutral/conditioned stimulus.
C) Use a mouse instead of a rat.
D) Color the water a disgusting color, too.