Until recently, only schoolchildren played soccer in the united states. now, it has become a popular sport, perhaps in part because of immigrants from latin america and other areas of the world where soccer is widely played. soccer is an example of in sports.
a. fad
b. collective behavior
c. trend
d. fashion

Collective behaviour.

Explanation:

It's a collective behaviour because paragraph says that is played for certain societies and that behaviour is influencing in american society.

gold discovery in california, and pioneer settlers were sometimes pulled west because they wanted to make a better living. others received letters from friends or family members who had moved west. these letters often told about a good life on the frontier. the biggest factor that pulled pioneers west was the opportunity to buy land.

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rain should be the answer.