Answer:
D) individuals with different personal goals agree to combine them in a collective effort.
Explanation:
A joint goal is one where different people come together and pool their resources to achieve a particular goal or objective. The collective effort is mutually beneficial to parties involved.
The advantage of working in groups toward a joint goal is that differing expertise is introduced and this makes the goal more achievable than when individuals attempt it alone.
This leads to formation of a team.