Choose the BEST revision for the beginning of sentence 29. a. There exist historians who believe
c. Historians, who believe
b. I know of some historians who believe d. Leave as is.

C as it makes the most sense and sounds the most appropriate.

Ifound this on google “what are motifs? a motif is a literary term that is an idea, object, or concept that repeats itself throughout a text. a motif gives clues to theme or reinforces ideas an author wants to emphasize.” i hope this for what your looking for