If a wave has a frequency of 2 hz what would it be in seconds?

Frequency is not a length of time.  It's exactly the opposite.
Frequency tells you how often something happens.  In fact,
the unit 'Hz' means 'per second'.

   Frequency of 2 Hz means "It happens at 2 per second."

The time it takes for the thing to happen once is exactly the
'reciprocal' of the frequency ... ' 1 ' divided by the frequency.

If the frequency is  2 Hz, then the thing happens every 1/2 second.

If the frequency is 74 Hz, then it happens every  1/74 of a second.

If the frequency is 1 KiloHz, then it happens every  1/1000 second.

If there was no gravity then their would be no downword force on the football to have it return the the grownd, and if there was no friction (mainly air friction) then there would be no opposing force the stop the ball from moving through the air allowing the ball to travle ∞.

Then the answer would be d then