Less than 35 years after the release of African honeybees outside sao polo,brazil, their descendants,popularly known as killer bees, had migrated as far north as southern texas.

a)
b) In less than 35 years since releasing African honeybees outside sao polo,brazil,
c) in less than the 35 years since African honeybees had been released outside sao polo,
brazil,
d) It took less than 35 years from the release of African honeybees outside sao polo, brazil ,when