The greatest height to which a man can throw a stone is h

Explanation
We know that the greatest height can be only achieved if the stone is thrown vertically upward and it is given by h=u22g
And the range or horizontal range is given byR=u2sin2/g which can maximize if sin2=1
Now putting the value of R in first equation we get R=2h
Final Answer
The correct option is option C.