Answer the following question: You are presented with the quiz "Why do we generally treat H2O?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "treating water is used to remove harmful substances before drinking" and "for a scientist, water is H2O whether from the Ganga or a tap". So, what's the best answer to the question?

Options:
a). to add water to crops.
b). hydration.
c). vaporization.
d). to water the garden.
e). to drink it.
f). looseness.
g). to track it.
h). evaporation.
Answer:
e).