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.
Prime numbers are numbers that are only divisible by 1 and themselves. So, to tell if a number is prime, look at its factors.
19:
1 x 19
29:
1 x 29
39:
1 x 39
3 x 13
So, because 39 has more than one set of factors, it's NOT a prime number.
1 I’m pretty sure hope this helps