The correct answer is C. -ology
Explanation:
In language, a suffix is a syllable or affix added at the end of a word to create other words. These along with prefixes and root words are the components of words. Additionally, each suffix has an establish meaning that is added to the meaning of the root word. In the case of the suffix "-ology" this means the field, study or science of as in the case of the word "psychology" that means the study of the psyche or mind or the word "biology" that means the study of the life. Thus, the suffix that means the study of is "-ology".
