The figure above shows the graph of the continuous function $g$ on the interval $[ 0,8 ]$. Let $h$ be the function defined by $h ( x ) = \int _ { 3 } ^ { x } g ( t ) \, d t$. On what intervals is $h$ increasing?\\
(A) $[ 2,5 ]$ only\\
(B) $[ 1,7 ]$\\
(C) $[ 0,1 ]$ and $[ 3,7 ]$\\
(D) $[ 1,3 ]$ and $[ 7,8 ]$