I'm assuming the word in italics is Specificity. This should be replaced with D. exercise.
Exercise and progression will enhance physical health when combined. By working on your levels of exercise and making sure they are a regular part of your weekly routine this should improve your physical health.
Major depressive disorder affects approximately 17.3 million American adults, or about 7.1% of the U.S. population age 18 and older, in a given year. (National Institute of Mental Health “Major Depression”, 2017)
