Answer
$D \lt A \lt C \lt B$
Work Step by Step
After contact, the charge on each sphere will be equal. The total charge remains, so each sphere will have half the total charge before contact.
$A: \quad \displaystyle \frac{-q+(-5q)}{2}=-3q,\ \quad 2q$ is transferred.
$B: \quad \displaystyle \frac{0+(8q)}{2}=+4q,\ \quad 4q$ is transferred.
$C: \quad \displaystyle \frac{+q+(-5q)}{2}=-2q,\ \quad 3q$ is transferred.
$B: \quad \displaystyle \frac{15q+(13q)}{2}=+14q,\ \quad 1q$ is transferred.
$D \lt A \lt C \lt B$
