I think B.
I got up to 240 and figure I was easily eating 3000+ cals a day (I'm almost 50). If you read here a lot, people VARY a lot in what they can or cannot do and still lose weight.
I got down to 220 (mostly thru exercise and one lifestyle change) before I got more serious about calories. I started with 2000 cals a day limit and have lost about 1-1/3 pounds a week over the first 3 months.
Personally I would not recommend a big calorie restriction. Losing the weight is not the hard part IMO, the hard part is losing the weight at a rate commensurate with sliding into maintenance as easily as possible - like setting a jet down on the runway, nice and easy. Losing weight too fast is not a good idea. I figure it took me years to get to this weight, there is no reason I can't wait one lousy year to take it off. Faster is going to be more painful, more likely for you to quit, more likely to have health problems, etc. Slow and easy I think. At your age, just by exercising consistently and dropping to 2500 cals, you are going to be losing a pound or two a week, that is plenty.
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