1 kilometre = _______ metres and 1 metre = _______ cm

Question

$\begin{array}{11} (a)\; \text{100 meters, 1000 cms} \\ (b)\; \text{1000 meters, 1000 cms} \\ (c)\; \text{10 meters, 100 cms} \\ (d)\; \text{1000 meters, 100 cms} \end{array}$