Answer:
a. motor skills and habits
Explanation:
Procedural memory is a type of long term memory which emphasis on how to perform a particular task. without awareness of the previous experience.
This type of memory guides and shapes us when we carry out frequent task. They are types if memories that are retrieved and make use of for the execution of sequential phases of integrated process involved in both cognitive and motor skills. Examples include; riding a bicycle, tying a shoe etc.
Hence, thee best way for Mary to think about the definition of procedural memory is through motor skills and habits.