Volumen de un cono con altura de 8cm y base de 4cm​

Aprojectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 704t. after how many seconds does the projectile take to reach its maximum height?

Which one is the correct answer, and why?

Ineed to know the ordered pairs for this equation i need the answer quick because it’s a timed test