Answer:
85 % = 17/20
Explanation:
It is given that,
85% of the land is above 4,000 feet in elevation.
We need to write a fraction that is equivalent to 85%.
We know that, percent means dividing by 100 i.e.

We can write 85 as 17×5 and 100 as 20×5
So,

5 will cancel out from numerator and the denominator

Hence, the correct option is (c).