We want the percentage change from 1755 to 7175.
Let's look at a formula to figure out the percentage change.

Where P is the percentage change.
New is the new value and Old is the old value.
Here, we are given:
New = 7175
Old = 1755
Substituting into the formula, we get:

Rounding this percentage increase, we have:
309%
The correct answer choice is C.