Answer:
Therefore letter C is the correct answer.
Step-by-step explanation:
In a projectile motion the total time in the air can be calculated using the following equation:
We analyze the y-component motion.

When the final velocity (v(f)) is equal to zero we calculate the upward time and multiplying it by 2 we find the total time in the air. So we will have:


We can see that the total time is directly proportional to the angle, then when θ increase t increase.
Therefore letter C is the correct answer.
I hope it helps you!