If a consumer's marginal rate of substitution of \(\operatorname{good} X\) for \(\operatorname{good} Y\left(\mathrm{MRS}_{X Y}ight)\) is equal to 2 , then the:

A. consumer is willing to give up two units of \(X\) for one unit of \(Y\).

B. slope of a line tangent to the indifference curve at that point is 2 .

C. slope of a line tangent to the indifference curve at that point is -2 .