My try: I wouldn't use "but". Sentence C: Remember that although the pill is highly effective, pregnancy can occur if the pill is taken at irregular times, if intercurrent illnesses such as fever and gastric upsets develop, or if you are taking some other drugs. Sentence C is the most beautiful one.
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DollI chose her as a wife.You used a wife, not your wife; how many wives are you going to get?
DollDon't worry, I am rich.I'm not worrying about your money; I'm worrying about the peace under your roof. It must be demanding for his management ability to be the master of your house.