14. $a , b , x$, and $y$ are real and positive.\\
$a$ and $b$ are constants.\\
$x$ and $y$ are related.
A graph of $\log y$ against $\log x$ is drawn.
For which one of the following relationships will this graph be a straight line?
A $y ^ { b } = a ^ { x }$
B $y = a b ^ { x }$
C $y ^ { 2 } = a + x ^ { b }$
D $y = a x ^ { b }$
E $y ^ { x } = a ^ { b }$\\