If x=kc and y=kt,then y-x =?
Just put in the given values of y and x
y - x = kt - kc
Now take k common
y - x = k(t - c)
You get (A) as your answer.
I would suggest you to go through a basic algebra book before moving on because it is necessary for you to know how to manipulate an equation (and related algebra) to do well in Quant.
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