Which of the following is an example of a long-term challenge? A. A medical diagnosis of multiple sclerosis
B. A severe bout with a seasonal flu or cold
C. Choosing which college to attend in the fall
D. Multiple high-stakes exams in the same week​

Can you translate this

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