Respuesta :
The word in italics which is "things" should be replaced with the word
"principles" to make this sentence more precise.
The given choices that are missing in the question are"
A. Acronyms
B. Principles
C. Muscles
D. Exercises
"Specificity and progression" are the two principles that pertain to keeping one's physical health. Therefore, we can conclude that "principles" is the best term to use in place of "thing."
"Specificity and progression" are neither muscles nor exercises, either. They are not acronyms though, as an acronym is a term created by connecting the first letters of a number of words, which is then spoken as a single word.
Thus, the correct word in place of "thing" to be used is "principles". Hence, the correct option is B.
To learn more about "Specificity and progression" here
https://brainly.com/question/12536161
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