For the data,\(\begin{array}{*{20}{c}} {x:}\\ {f\left( x \right):} \end{array}\begin{array}{*{20}{c}} 0\\ 5 \end{array}\begin{array}{*{20}{c}} 1\\ 2 \end{array}\begin{array}{*{20}{c}} 2\\ 1 \end{array}\begin{array}{*{20}{c}} 3\\ 3 \end{array}\begin{array}{*{20}{c}} 4\\ 7 \end{array}\)the value of \(\mathop \smallint \nolimits_0^4 2f\left( x \right)dx\) will be:

• A. 24
• B. 21
• C. 42
• D. 12