Answer:
I think it is sending out tweets.
Step-by-step explanation:
I don't see how writing a blog can get you money.
Entering design contests will only get you money if it is a prize and you win/earn it.
recording podcasts I don't think really give you money and if you are a full time designer, people need to be able to see your art/product.
this is why A) sending out tweets makes sense b/c lots of people use social media and by creating a business account Ben will be able to get recognition from other people and be able to be offered projects. in art, being known is important because without people knowing who you are, your job is pretty much nothing (my opinion, please don't get upset or anything).