The correct answer to this open question is the following.
Although you forgot to attach the options to this open question we can say the following.
Rebecca stops after reading two or three paragraphs in her psychology text. She rehearses and thinks about the material she has just read before continuing on. The aspect of memory Rebecca is most concerned with is the limited duration of short-term memory.
Psychologists refer to this short-term memory as the active memory that is able to store few pieces of information in the brain and the individual can access it for a short period of time. Scientists believe that the duration of this information could be of 30 to 40 seconds.
This type of memory is brief and limited.