How Do Silk Growers Take Advantage of the Knowledge of Insect

How do silk growers take advantage of the knowledge of insect hormones?

A) They remove the corpora allata from silkworms to eliminate the production of juvenile hormone which causes them to pupate. This causes them to reproduce faster, creating more animals that can spin more silk.
B) They spray analog juvenile hormone on silkworms that causes them to pupate and reproduce faster, creating more animals that can spin more silk.
C) They spray analog juvenile hormone on silkworms to prevent them from pupating therefore creating larger larvae that create more silk.
D) They remove the corpora allata from silkworms to eliminate the production of juvenile hormone and prevent them from pupating. This creates larger larvae that create more silk.