急！！问一道scJJ

Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil, their

descendants, popularly known as killer bees, had migrated as far north as southern Texas.

(A) Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil,

(B) In less than 35 years since releasing African honeybees outside Sao Paulo, Brazil,

(C) In less than the 35 years since African honeybees had been released outside Sao Paulo,

Brazil,

(D) It took less than 35 years from the release of African honeybees outside Sao Paulo, Brazil,

when

(E) It took less than the 35 years after the time that African honeybees were released outside

Sao Paulo, Brazil, and then 

答案是什么啊？？我觉得是C，我没做过这题，我不是很清楚答案……马上就考了，请大家帮忙