The correct order of dynamic markings from softest to loudest is:
pianissimo, piano, mezzo-piano, mezzo-forte, forte, fortissimo.
Looking at the options provided, the option that matches this order is:
pianissimo, piano, fortissimo, forte.
However, none of the listed choices accurately reflect the correct ordering of dynamic markings from softest to loudest. The closest option would be "pianissimo, piano, forte, fortissimo," but it is not explicit in the list you've provided.
Please review the options again to determine if there's any ambiguity or if something is missing!