Which of the following can minimize engine effort and save fuel?

The best answer is (a) which is universal law is in effect at all times. it is constantly at play in everything we do and governs our lives. it is also important to note that universal law applies to not only everything on earth, but everything in the universe as well, which is another reason why it is in effect at all times.

The big glowy thing is called the sun it is a star in our galaxy and is over 1 million degrees

There was no intial y-momentum so the net final y-momentum must also be 0. they can have final velocities in the y-direction