A bob is hanging over a pulley inside a car through a string. The second end of the string is in the hand of a person standing in the car. The car is moving with constant acceleration a directed horizontally as shown in figure. Other end of the string is pulled with constant acceleration a vertically. The tension in the string is equal to

• A. \[m\sqrt{{{g}^{2}}+{{a}^{2}}}\]
• B. \[m\sqrt{{{g}^{2}}+{{a}^{2}}}-ma\]
• C. \[m\sqrt{{{g}^{2}}+{{a}^{2}}}+ma\]
• D. \[m\left( g+a \right)\]