Find a Formula for A_n for the Arithmetic Sequence $\frac { 6 } { 7 }$

Multiple Choice

Find a formula for a_n for the arithmetic sequence.
A₁ = 0, d = - $\frac { 6 } { 7 }$

A) a_n = $\frac { 6 } { 7 }$ n - $\frac { 6 } { 7 }$
B) a_n = - $\frac { 7 } { 6 }$ n - $\frac { 7 } { 6 }$
C) a_n = - $\frac { 6 } { 7 }$ n + $\frac { 6 } { 7 }$
D) a_n = $\frac { 6 } { 7 }$ n + $\frac { 6 } { 7 }$
E) a_n = - $\frac { 7 } { 6 }$ n + $\frac { 7 } { 6 }$