As the PH scale decreases or increases, how does this affect the acidity?

When pH decreases acidity increases,

and if pH increases  acidity decreases.

Explanation:

1 2 3 4 5 6 7(neutral) 8 9 10

acidic                          basic

So, when pH decreases acidity increases,

and if pH increases  acidity decreases.

i think it's c. i'm not sure but i think so.