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經濟原文 看不懂 也不知道意思 希望大家能幫幫忙~

Consider the indifferent curve map and budget constraint for two goods, beef and potatoes. Suppose the good measured on the horizontal axis, potatoes, is a Giffen good. Beef is measured on the vertical axis and is a normal good. When the price of potatoes increase, the substitution effect causes



a. an increase in the consumption of potatoes, and the income effect causes a decrease in the consumption of potatoes. The substitution effect is less than income effect.



b. a decrease in the consumption of potatoes, and the income effect causes an increase in the consumption of potatoes. The substitution effect is greater than the income effect.



c. an increase in the consumption of potatoes, and the income effect causes a decrease in the consumption of potatoes. The substitution effect is greater than the income effect.



d. a decrease in the consumption of potatoes, and the income effect causes an increase in the consumption of potatoes. The substitution effect is less than the income effect.
為什麼答案是D阿 減少pototoes 又增加....???