Step 1: Look for the odd one out.
Three options describe things that bring people together. One describes something that keeps people apart. We find that one.
Step 2: Test the first three options.
Proximity means being physically near, similarity means being alike, and common motives mean wanting the same thing. All three increase contact and attraction, so each helps a group form.
Step 3: Test option (4).
Individual goals are aims that belong to one person alone. They do not give members a reason to act together, so they do not build a group.
Step 4: Link to the question wording.
The question uses the word NOT. The option that does not support togetherness is Individual goals.
Step 5: Put it in plain words.
A cricket team forms because players live near each other, like similar things and want to win the same match. If every player only chased his or her own score and nothing else, there would be no reason to stay together. So individual goals do not help group formation.
Final Answer:
Option (4), Individual goals, is not an important condition for group formation.\[ \boxed{4} \]