I see that you have corrected forge to forged. Forged forth has a different meaning then burst forth. Burst "break suddenly and violently apart, spilling the contents, typically as a result of an impact or internal pressure." forged used as a transitive verb " to put a lot of effort into making something successful or strong so that it will last" In the sentences you provided, burst would be correct if he produced his work all at once, but forged is correct since he produced his work over time.

I agree with the other answers. Like Becky said.... 'forge' would have to be in past tense 'forged' to match the tense of sentences that follow. The answer must be B. I always wonder where these tests come from... perhaps it was a typo in the answer key? good luck!

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.

I've never heard or said 'forge forth' in my life. It's not a phrase. Further, I agree with Gary and Peachey. It's time for you to find a native speaker to teach you.

I agree with Gary - the question is rubbish, and clearly not written by a native speaker. The context is extremely weak.