Select the option that can replace the question mark (?) in the following equation.
\(\frac{{{{\left( {0.2} \right)}^3} - {{\left( {0.1} \right)}^3}}}{{{{\left( {0.2\; + \;0.1} \right)}^2}}} =?\)
1
\(\frac{3}{{40}}\)
2
\(\frac{1}{{18}}\)
3
\(- \frac{7}{{90}}\)
4
\(\frac{7}{{90}}\)