Place the following integrals in order of size, starting with the smallest.
$$\begin{aligned}
& P = \int _ { 0 } ^ { 1 } 2 ^ { \sqrt { x } } \mathrm {~d} x \\
& Q = \int _ { 0 } ^ { 1 } 2 ^ { x } \mathrm {~d} x \\
& R = \int _ { 0 } ^ { 1 } ( \sqrt { 2 } ) ^ { x } \mathrm {~d} x
\end{aligned}$$
A $P < Q < R$\\
B $P < R < Q$\\
C $Q < P < R$\\
D $Q < R < P$\\
E $\quad R < P < Q$\\
F $R < Q < P$