According to some critics, the quality that is being fostered in the students of U.S. high schools is inadequate learning. Hence, Option C is correct.
When the learning or the education or the knowledge that one is acquiring either from school, college, or any such place where the learning process is going on and that is not up to the mark.
Such a kind of learning is known as inadequate learning. Some of the synonyms of inadequate are defective, insufficient, and incompetent. In the case of US high schools, students' expectations for success are high in comparison to the learning standards.
Thus, Option C is correct.
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The complete question is attached in text form:
Some critics argue that too often U.S. high schools foster which qualities in students?
1) Passivity 2) Low expectations 3) Inadequate learning.