If \(a = 2b = 3c\), what is the average (arithmetic mean) of \(a\), \(b\) and \(c\) in terms of \(a\)?
(A)\(\frac { a } { 6 } \) (B)\(\frac { 2a } { 11 } \) (C)\(\frac { 6a } { 5 } \) (D)\(\frac { 11a } { 18 } \) (E)\(\frac { 2a } { 3 } \)
D