The correct option is B Apolysis
The shedding of gravid proglottids is termed as apolysis. Small groups of gravid proglottids regularly detach from the posterior end of strobila and pass out with the host's feces. The two main purpose of Apolysis is
(a) It serves to transfer the developing embryos to the exterior, where they can be ingested by the secondary host.
(b) It limits the size of the body which may otherwise attain enormous length due to continues proliferation in the neck region.
So, the correct answer is option A.