PLEASEEEEE ANSWER ASAP!! *picture attached* RIGHT ANSWER GETS BRAINLIST

an=
800+(n-1)28,000
800+(n-1)31,200
28,000+(n-1)800
31,200+(n-1)800

PLEASEEEEE ANSWER ASAP picture attached RIGHT ANSWER GETS BRAINLIST an 800n128000 800n131200 28000n1800 31200n1800 class=