Question

in the 1940s the population of new york city was booming. there were so many people that the government was worried the city might run out of fresh water. what if millions of people turned ____ their sinks and tubs and no water came out? itd be a disaster!
options:
off
on
over

Explanation:

The phrase "turned on" is the correct phrasal verb to describe activating a sink or tub to get water, which fits the context of worrying about no water coming out when people try to use these fixtures.

Answer:

on