Centerville Has 200 Unemployed People

Centerville has 200 unemployed people. Of these 200 people, 35 are unemployed for two weeks before finding a new job, 55 are unemployed for four weeks before finding a new job, 30 are unemployed for six weeks before finding a new job, 15 are unemployed for 10 weeks before finding a new job, and 65 are unemployed for 15 weeks before finding a new job. Approximately what is the average spell of unemployment in Centerville?

A) 2 weeks
B) 5 weeks
C) 8 weeks
D) 11 weeks
E) 14 weeks