Which is correct?

....................; therefore, a lot of time has to be spent on chores like cleaning up and repairs.

A- Space stations are like large residences that need constant care and attention

B- Without the effect of gravity in space, blood and other body fluids begin to flow towards the head.

C- In some ways, living in a space station is like being stranded on a desert island

D- Each day on the International Space Station is meticulously planned by mission control

E- Astronauts on the International Space Station have to survive far from home for months at a time.

I think the answer is A but I'm not sure which one is correct?