A student throws a projectile horizontally at a target a horizontal distance $R$ away. The projectile is released from a height $H$ above the ground and strikes the target a height $h$ below the release point, as shown above. Which of the following indicates the values that must be known for a student to calculate the initial speed of the projectile

A$)$ R only

B$)$ H only

C$)$ H and R only

D$)$ h and R only

E$)$ H$,$h and R