Michael's mother always forgets to take her heart medication. so, every night michael calls her after dinner to remind her about her medicines. this demonstrates that michael's mother is experiencing a decline in memory.

This demonstrates that Michael's mother is experiencing a decline in "prospective" memory.

Prospective Memory refers to the point when you make sure to play out an activity at the proper time that you previously proposed to achieve. 'Remembering to remember' is another approach to portray this sort of memory. Prospective memory is utilized an incredible arrangement in our everyday lives. 
Examples are making sure to take medicine at a specific time, making sure to set your caution for a critical gathering etc.

this demonstrates that michael's mother is experiencing a decline in: Prospectives. Prospectives refers to how we see something in particular in the future (such as our health, investment, etc)
By not taking the medicine, michael's mother has neglected her health and does not see what may happen to her and her family if she's suddenly have to go because of the heart condition

Bmust be the answer, as technically all organs move, so a is incorrect. all organs are made of different types of cells, so that isn’t a problem, so c is also incorrect. human hearts are very similar to many other animals’ hearts, so d is also incorrect, yet the heart is made of muscle, which is hard to grow in the lab so it would be correct to say b