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Little late to this one, but my first impulse is that (A) sounds simple, clear, & direct, no problems.
Looking further at "rival" for any idiom problems, I'm sure that's a common usage, and I can't find any "rule" that frowns on "rival ... for". In fact if you look at the usage samples at dictionary.com, there are a couple of examples using "rival x for y"
Check out this awesome article about Anderson on Poets Quants, http://poetsandquants.com/2015/01/02/uclas-anderson-school-morphs-into-a-friendly-tech-hub/ . Anderson is a great place! Sorry for the lack of updates recently. I...