The lamp in the diagram is not very stable and falls over easily.
Which row shows changes that would definitely make the lamp more stable?
\begin{tabular}{|c|c|c|}
\hline & base & centre of gravity \\
\hline A & narrower & higher \\
B & narrower & lower \\
C & wider & higher \\
D & wider & lower \\
\hline
\end{tabular}