It is best to say that efficient plumbing .
a.
reduces water pollution by using less water
b.
reduces water pollution by using cleaner water
c.
increases water pollution by using more water
d.
reduces water pollution by using dirty water

a. reduces water pollution by using less water

Explanation:

answer; /// i believe the name is ( check first good luck.hope this

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.