Carli and Angela share a cell phone plan and split the bill each month last month their bill was 109 Carli went over her limit on her phone so her share the bill was 15 more than Angela's account over

Carli and Angela share a cell phone plan and split the bill each month last month their bill was 109 Carli went over her limit on her phone so her share the bill was 15 more than Angela's account overrage charge which system of equations represents this situation

A c+a=15

c=a+109

B c+a=109

c=a+15

C c-a=15

c=a+109

D c+a=109

a=c+15