Actually, I would use "fortune" over the other 2 choices..... But, if the sentence is minus the adjective, "considerable", "A" is the better choice. My friend Tom made his money selling cars.
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Liveinjapanbut with A doesn't it make sense?No. It's the combination of considerable with money that's unidiomatic. We never say "my considerable money", "your considerable money", "his considerable money", and so on. However, "a considerable amount of money", perhaps.
CalifJim However, "a considerable amount of money", perhaps.Understand!