Olga didn't have a pen handy when her boss gave her the phone number of an important client, so she mentally rehearsed the number until their call. While memory provided storage for the phone number, memory allowed her to rehearse it for longer maintenance.

While short-term memory provided storage for the phone number, working memory allowed her to rehearse it for longer maintenance.

Explanation:

Short-term memory is a part of working memory. Short-term memory allows us to process and retain information for a short period of time. Information is usually retained only long enough for its use at that very moment. Working memory, on the other hand, also includes retaining information, but goes a little further. It allows for the manipulation of the information for a longer period of time. In summary, short-term memory retains information, working memory retains as well as uses information.

i think it's b or c hope this