Answers are given below as following :

(a) : I have acquired pieces of information about Garment washing, purpose, types of washing, impacts of washing, types, and capacity of chemical utilized in the washing plant. 

(b) :It would be better if I learn all of this by performing with practical experiences.

(c) : I have gone through all the things that our respected sir had described previously & understood that.

Thank you sir,for teaching us in good way.