If two people have a common goal then by working together they can accomplish that goal.
This justifies what answer for what question? Q & A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
If two people have a common goal how can they accomplish that goal?
Options:
- agree with each other
- work together
- make love
- have fun
- shake hands
work together