An aircraft in trimmed condition has zero pitching moment at
(A) its aerodynamic centre.
(B) its centre of gravity.
(C) $25 \%$ of its mean aerodynamic chord.
(D) $50 \%$ of its wing root chord.
An aircraft in trimmed condition has zero pitching moment at
(A) its aerodynamic centre.
(B) its centre of gravity.
(C) $25 \%$ of its mean aerodynamic chord.
(D) $50 \%$ of its wing root chord.