The figure below shows the change in demand for Commodity X which is a normal good. Use it to answer the question that follows.

Which of the following caused the change in demand from D\(_{1}\) D\(_{1}\) to D\(_{2}\)D\(_{2}\)

A. Fall in the income of consumers
B. Rise in the price of a substitute  
C. Rise in the price of a complement
D. Fall in the supply of commodity X

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Correct Answer: B