I can start 3 out of these 4 running backs, who do I start this week, in NFL Fantasy Week 12?

You have great choices this week and all are good starts but I would sit Maurice Jones-Drew because the Jags will probably be trailing the entire game and may abandon the running game. Jacksonville has forgotten who they are several times this year, they are quite a disappointment. Gerrard is a bust and is holding his team back, Del Rio may lose his job for his stupidity.