For any three positive real numbers $a, \;b$ and $c,\; 9(25a^2 + b^2 ) + 25(c^2 – 3ac) = 15b(3a + c)$, Then

Question

( A ) a, b and c are in G.P.
( B ) b , c and a are in G.P.
( C ) b, c and a are in A.P.
( D ) a, b and c are in A.P.