Noland bought a fancy new smart phone. It was a different brand of phone than his old phone, so he spent quite a few frustrating hours learning to use the new one. The problem was that he kept trying to tap icons on the new phone in the places they had been on his old phone. Noland’s problem was most likely due to

a. retroactive interference.

b. encoding failure.

c. proactive interference.

d. decay theory.