Question

Help PleaSE:) ->Grammar

Answer 1

Option B. On hot days, they say to drink plenty water. (The sentence makes no sense. So it is incorrect.)

Answer 2

B. On hot days, they say to drink plenty of water.
This sentence is incorrect. It should be:
On hot days, you should drink plenty of water
OR
Plenty of water should be drunk on hot days
OR
They say plenty of water should be drunk on hot days.