Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

For a Giffen good, the:
Option A:demand curve is positively sloped.
Option B:substitution effect overwhelms the income effect.
Option C:income and substitution effects are in the same direction.

Answer: A