Becky spends her money on only two things: hiking boots and paintbrushes. For her, the income effect dominates. When the price of paintbrushes rises, Becky will naturally buy fewer paintbrushes. And she will buy hiking boots.

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Explanation:

When the price of a goods increases two effects known as substitution and income effect will occur.

Substitution effect occurs when an increase in the price of a good encourages a consumer to buy alternative goods.

Income effect occurs when the price of a good rises, this reduces drastically the disposable income, hence, there will be a lower demand for the goods.

In the question, we are told income effect dominates. The rise of price of paintbrushes only means Becky can purchase fewer paintbrushes and more of the bulk of the money she has is used in purchasing hiking boots instead.

a) both were commissioned explorers