The predicate of the sentence provided in the question is "is six inches," since the predicate of a sentence is everything that is not the subject.
We can define predicate as the part of the sentence that contains the verb and everything else that is not the subject. The predicate, in other words, is the part that gives us information about the subject. For example:
With that in mind, it is easy to analyze the sentence "The average length of thesis creatures is six inches." Here we have quite a long subject, "The average length of thesis creatures." Therefore, the predicate is "is six inches."
With the information above in mind, we can conclude that the answer provided is correct.
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