I don't think they will choose c to curate. This will cost to much time with a revenue that will be to low. Especially if you look at the time spend in relation to the revenue.
Option b another dapp will most likely only be chosen if that brings a nice return. I don't know if these are available.
Option a selling votes at the black market could be their best alternative. You actually only need one active Steemonian and upvote all his posts + comments. And that Steemonian then needs to transfer (for example) 75% of the Steem revenue to the whale.
If someone is a little active him/her self, then I would go for option f and self vote as much as possible.
I think a few investors are just in Steem to gamble on a very big increase. They probably won't stop gambling and just go for some dapp with a little return.
Investors that are only in with a small amount purely for the money could power down and turn for example to EOS.
This is my hypothetical answer 😁
'They'? I'm asking you :) Not much time to set up an auto on 50 of your favourite authors really...
B would need to show a least some return for most, but it's nice to delegate to projects that support the community and don't provide a return.
Selling votes via memo used to be popular and quite obvious - this was at a time we had 'good' whales who would take action.
I can't believe I missed selfies off the list :D
Thanks for your feedback!
To be honest I never understood why there was a black market for vote selling since it was much easier to upvote your own comments. All one needed to do was write 10 comments a day. But maybe I'm missing something.....?