_____ are health care professionals who manipulate the spine to treat pain-related conditions

Which of the following statements about part-time work during high school is true?

A) About 10 percent of U.S. high school students work part-time during the school year. B) The more hours students work, the more likely they are to drop out of school. C) Heavy commitment to part-time work is not harmful as long as the job involves low-level repetitive tasks. D) Students who work 20 or more hours a week tend to be highly committed to their studies.

When people persist in using problem-solving strategies that have worked in the past, they are displaying ____________________

Fill in the blank(s) with correct word