Find the sum or difference. Simplify if possible.

[tex]\frac{4}{12}[/tex] + [tex]\frac{9}{12}[/tex]

A. 1[tex]\frac{1}{12}[/tex]

B. [tex]\frac{1}{4}[/tex]

C. [tex]\frac{13}{24}[/tex]

D. [tex]\frac{13}{144}[/tex]