TOEFL / IELTS Grammar - find the error

ScottsEnglish

Find the error in the underlined words in the following sentence:

While lower prices often encourage consumers to buy products, there are also products in the same category which depend of their higher quality, equating with higher prices, in order to be purchased.

a. consumers to buy products
b. there are also products
c. which depend of their higher quality
d. in order to be purchased

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While lower prices often encourage consumers to buy products, there are also products in the same category which depend on their higher quality, equating with higher prices, in order to be purchased.