So they can either cover birth control or drop insurance for all their workers. And they think the latter is the moral thing to do? Strange belief system they have.
You're missing option C: Sue the government to overturn Obama's idiotic decision that violates the separation between church and state.
Birth control pills, especially Plan B, shouldn't be required to be covered under health insurance plans to begin with. If they are, then why aren't condoms for men covered, too? To not do so is arguably sexist and homophobic.