Final answer:
The term "decanormal" most likely means something related to ten norms, as "deca-" is a prefix meaning 'ten', and "normal" is the root word implying a standard or typical level.
Step-by-step explanation:
Based on an understanding of prefixes, root words, and suffixes, the word "decanormal" can be broken down into the prefix "deca-" which means 'ten' and the root word "normal". Considering this breakdown, the most likely meaning of "decanormal" is A) Something related to ten norms. This would imply a measurement or standard that is ten times the normal amount. Option B) Beyond normal standards, C) Half of the normal measurement, and D) Below normal levels do not align with the prefix "deca-", which specifically denotes the number ten.