What is the gender division of labor? 

Gender division of labor refers to categorizing the work based on gender. Women have to look after household work, and the man's responsibility is to go to work and earn money. Women have to look after children and other family members. They have to cook, wash clothes, clean the house, and many more. 

Classified work based on caste is not gender division of labor. So it is an incorrect option. 

Therefore, the correct answer is an option (A).