I would suggest (c).
I don't know how it works for you, but here as a government engineer, we have a situation where above some salary level, at 14% (max contribution to TSP) or even less, if you make enough $$$, you run the risk of hitting the upper limit of contributions prior to the end of the year. If you hit the limit ($14 or 15k, I think), then you loose the matching contributions for the rest of the year, so essentially throw away money. As a result, those who are smart and above the salary threshhold drop their contributions at the beginning of the year, and then increase it at the end to ensure that they maximize matching contributions and still hit their personal max contribution. If this effects you in a similar way, then you must consider it.
Otherwise, I pick (c) because based upon everything that I read by you on here, you do a heck of a good job of saving and all-around money management. This is a good sign. If Im correct, youve been saving well for a good long time now, and have been adhering to best practices of money management for the same. Chances are you have a nice load of cash or monetary equivalents that will do you well in the future.
By picking (c), you are still increasing your savings allocation further, so are getting the federal tax advantage and are building a larger nest egg, but also will have a few extra bucks to buy yourself an extra widget every now and again, go on a trip (at least a weekend trip!), or at least go out to dinner with your family once or twice extra in the year. You only live once, and you might as well provide yourself a little bit extra enjoyment now, while working hard and doing everything that you do to be deservant of the raise that youll be getting.
Often (at least I know I do, Im at 14% contribution), its easy to get so caught up in the future, that you sacrifice enough to not have all that much enjoyment in the here and now... the key is to strike a good balance to allow you to be more than just reasonably happy now, and yet achieve aggressive goals in the future.
JMH