The maximum value of \(\sin \left( {{\rm{x}} + \frac{{\rm{\pi }}}{5}} \right) + \cos \left( {{\rm{x}} + \frac{{\rm{\pi }}}{5}} \right),\) where \(\text{x }\!\!~\!\!\text{ }\epsilon \left( 0,\frac{\text{ }\!\!\pi\!\!\text{ }}{2} \right),\) is attained at

• A. π/20
• B. π/15
• C. π/10
• D. π/2