It will be A. For multiple '$\oplus$', the derivation is possible only via '$X$' which is on left side of '$\oplus$' in the production. Hence it is left associative.
For multiple '$*$', the derivation is possible only via '$Y$' which is on the right side of '$*$' in the production. Hence it is right associative.
If both left and right derivations were possible, the grammar would have been ambiguous and we couldn't have given associativity.