What issue was john muir associated with?
a. prison reform
b. improving treatment of people with mental illnesses.
c. corruption among elected officials.
d. conservation

John Muir was associated with the issue of conservation.

Option D

Explanation:

John Muir is regarded as one of the greatest environmental philosophers the world has ever had. His stand for the conversation of the environment was remarkable and is still taken reference from by the new age conservationists.

The idea of having protected national parks was first put forward by John Muir. For that reason alone, he is called the father of national parks.