The correct order of dynamic markings from softest to loudest is:
pianissimo, piano, mezzo-piano, mezzo-forte, forte, fortissimo.
Since the options you provided do not match this exact list, the closest correct order based on the given choices is:
piano, mezzo-forte, forte, fortissimo.
However, it looks like there is a typo in the options since it should have included "pianissimo" before "piano."
If I had to choose strictly from the presented options, the best correct answer is:
piano, mezzo-forte, forte, fortissimo.