Which sentence is a run-on sentence? a. the weather may change suddenly higher up the mountain. b. thomas thought about it and then opened the trunk to look. c. the weather is nice today rainy, wet and cold tomorrow. d. thomas did not like the look of the dark, dusty trunk.

because of all the immigration, america became one big melting pot. the diversity of cultures from all over the world made america somewhat divided as well. people that immigrated stayed with their kind, and their traditions, while native born americans stayed with their kind and their traditions. normally, people born in american scorned the immigrants as well. the new religions also divided america. in summary, it took away from the american culture and identified america as the "melting pot."

what is the passage

a.) it provides a clue to solve the mystery.