I believe the answer is D) a social movement.
The choices are:
short
medium
average
long
The answer is a long-term goal. They are both in a situation where they decided to be ready for having their family. Earning would take time. Being financially ready for a family would mean preparing for a house, savings for education, health, and different things. It would let them have a longer preparation to be ready.
The question is kinda lacking. Probably, it has choices to make the question answerable.
