Given that the selling price is $200,the

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To find the percentage increase from the cost price to the selling price, we need to use the formula: 
Percentage increase = ((selling price - cost price) / cost price) x 100%
Let's assume the cost price to be x. So we have:
Percentage increase = ((200 - x) / x) x 100%
We need to choose the option that gives us a percentage increase closest to the answer. 
Option A: If the cost price was $100, then the percentage increase would be ((200 - 100) / 100) x 100% = 100%, which is too high.
Option B: If the cost price was $120, then the percentage increase would be ((200 - 120) / 120) x 100% = 66.7%, which is the closest to the answer and hence the correct option.
Option C: If the cost price was $80, then the percentage increase would be ((200 - 80) / 80) x 100% = 150%, which is too high.
Option D: If the cost price was $50, then the percentage increase would be ((200 - 50) / 50) x 100% = 300%, which is too high.

Given That the Selling Price Is $200,the