True or false: Mimi is enthusiastic about baking and has used her grandmother's apple pie recipe for a number of years. Lately, she has been enrolled in pastry classes where she has learned to make six varieties of apple pie, so when she tries to make her grandmother's recipe, she becomes confused about ingredients. This is an example of retroactive interference.

True.

Explanation:

The interference theory explains the memory of the human brain. These memories are long term memories. Two main types of interference are proactive interference and retroactive interference.

The retroactive interference means when the older memories vanishes due to the learning of the new memory. The previously learned memories are forgotten by the individual. The same thing has happened with Mimi as she forgot the previous recipe due to the new memory.

Thus, the answer is true.