A stone is dropped into a well in which the level of water is h below the top of the well. If v is velocity of sound, the time T after which the splash is heard is given by

• A. \[T=2h/v\]        
• B. \[\text{T=}\sqrt{\left( \frac{\text{2h}}{\text{g}} \right)\text{+}\frac{\text{h}}{\text{v}}}\]
• C. \[\text{T=}\sqrt{\left( \frac{\text{2h}}{\text{g}} \right)}\text{+}\frac{\text{h}}{\text{g}}\]
• D. \[\text{T=}\sqrt{\left( \frac{\text{h}}{\text{2g}} \right)}\text{+}\frac{\text{2h}}{\text{v}}\]