All of the above. I can testify from personal experience.
The bus's position
at time
is

If we take the bus's rear's starting position to be the origin, then the position of the mate (?) is given by

The mate draws level with the rear of the bus when
:

Drop the units to make things simpler:

So it would take 3 seconds for the mate to catch up to the bus.
C. a method or device used to prevent pregnancy
Intravenous mixtures are prepared in sterile conditions. They are infusions that are given through injections and syringes. It is important to keep the preparation sterile as it is directly injected to the veins which is a faster way to assimilate to the system. Thereby, proper preparations must be applied. ANswer is D.