Answer:
y = -4/25·x^2/(cos(θ)² +tan(θ)x; parabola
Step-by-step explanation:
Ballistic motion in rectangular coordinates is almost always modeled by a downward-opening parabola. That only leaves the second and third equations as possible answers. The coefficient of x² in the second equation is positive, so that is not the answer.
The appropriate choice is the third one, ...
y = -4/25·x²/cos(θ)² +tan(θ)x; parabola
