Final answer:
Learned motor behaviors are classified as b) skill memories, which are a form of implicit, procedural memory that allows us to perform actions without conscious thought.
Step-by-step explanation:
Learned motor behaviors are referred to as b) skill memories. These are a type of implicit memory and fall under the category of procedural memory, which is the subset of long-term memories.
Procedural memory involves the memory for the performance of particular types of action and is known for allowing us to carry out tasks without conscious awareness, such as riding a bicycle, playing an instrument, or typing on a keyboard.