Ayuda pls Does the graph represent a function? Why or why not?

Answer choices are
A- yes, because it passes the horizontal line test
B- No, because it fails the horizontal line test
C- No, because it fails the vertical line test
D- Yes, because it passes the vertical line test

i pretty sure it is

5+2x=a

asdasdsaadsaddsasds

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.