When the market price shift from one point to another, the total market demand has not changed in the demand curve. Thus, the correct answer is B.
A demand curve represents a correlation between the price of the product and the quantity of the desired product. This is represented with the help of a graph, where the vertical axis keeps the price and the horizontal axis brings the desired quantity.
When the market price shift from one position to another position in the demand curve, it would not affect the total market demand because it has just shifted and not increased the prices.
Therefore, the correct answer is B that market demand has not changed.
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