B is by far the best answer. C could technically be correct if you changed the verb form, though it would still be a pretty awkward turn of phrase, but B can just be put straight into the sentence with no alteration. In the context of the question "forge" has many different meanings because it is actually lots of older words rolled into one. In one of its meaning it means to advance rapidly in progress or on a journey usually only in a physical sense though. Fair warning, it can also mean advance slowly and steadily since it's a contranym. It is most commonly paired with "ahead". A also wouldn't be that bad and wouldn't require changing the verb form. Actually come to think of it C is the worst of the three answers since it is the only one which not only feels awkward, but also has to be changed before it can be put in the sentence.