# Alternating current cannot be measured by $DC$ ammeter because
$\begin {array} {1 1} (A)\;AC\: cannot\: pass\: through\: DC & \quad (B)\;AC \: changes \: direction \\ (C)\;Average\: value\: of \:current\: for\: a \: complete\: cycle\: is\: zero & \quad (D)\;DC\: ammeter\: will \: get\: damaged \end {array}$