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Each of the following sentences is followed by four words or group of words. Fill in the blanks with the appropriate word or group of words.

What is the correct answer?


Infant mortality rate in China has____ from 200 per thousand to 14 per thousand.

A. retarded

B. declined

C. contracted

D. minimised

Please do not use chat terms. Example: avoid using "grt" instead of "great".