Respuesta :

Answer:

D

Step-by-step explanation:

The rest you can elimate because of obvious inferring and reasoning so process of elimination
The answer is C
x= months
y=$
Constant of proportionality (C)=y/x
x=1, y=3.5
3.5/1=3.5
x=2, y=7
7/2=3.5
x=3, y=10.5
10.5/3=3.5
x=4, y=14
14/3=3.5
x=5, y=17.5
17.5/5=3.5
C=3.5