TOEFL / IELTS Grammar - Find the error

ScottsEnglish

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

Even if India's economy is rapidly growing and is now the sixth largest economy in the world, it cannot be considered successful based on European standards because a large part of its population remain in poverty without access to basic resources such as clean water and consistent electricity.

a. Even if India's economy
b. it cannot be considered
c. its population remain
d. access to basic resources

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Even if India's economy is rapidly growing and is now the sixth largest economy in the world,  it cannot be considered successful based on European standards because a large part of its population remains in poverty without access to basic resources such as clean water and consistent electricity.