The correct option is A the locus of the various combination of the two commodities which yield same level of satisfaction
The indifference curve is a combination of two goods which would give the consumer the same amount of utility and satisfaction.Every point on the indifference curve would be a point where the consumer is indifferent. The indifference curve is downward sloping because for the consumer to purchase of more of some good, it has to give up some of another good.