The correct order of dynamic markings from softest to loudest is:
pianissimo, piano, mezzo-piano, mezzo-forte, forte, fortissimo
However, from the provided options, the one that is most along these lines, though it doesn't follow the full order, is:
pianissimo, piano, forte, fortissimo
This option includes the softest (pianissimo) and the loudest (fortissimo), with piano and forte in-between, making it the correct choice among the options provided.
So the answer is:
pianissimo, piano, forte, fortissimo