The local taxi charges $3.00 plus $1.25 for every mile traveled. Determine whether the function is proportional or non proportional.
A) Non-Proportional; the function is written as y = mx + b
B) Non-Proportional; the function is written in y = mx
C) Proportional; the function is written as y = mx + b
D) Proportional; the function is written as y = mx