Suppose a quantilty x can be dimensionally represented in terms of M,L and T, that is `[x], M^aL^bT^c`. The quantity mass
A. can always be dimensionally represented in terms of L, T and x
B. can never be dimensionally represented in terms of L, T and x.
C. May be represented in terms of L, T and x if `a!=0`
D. does not exist