I want to condition a pet pig to come running for a food reward when i blow a whistle. In the process of this conditioning effort, the main is to?

I want to condition a pet pig to come running for a food reward when i blow a whistle. In the process of this conditioning effort, the main is to?

A. teach the pig to expect food when its hungry

B. pair a condtioned stimulus with an unconditioned stimulus

C. teach the pig to pay attention to the sound of a whistle 

D. pair a neutral stimulus with an unconditioned stimulus