Unreliable narrators are startling because, generally readers expect the storyteller to be

a) the author
b) authoritative
c) intelligent
d) cautious

The correct answer is B. Authoritative

Explanation:

A reliable narrator is a type of narrator that cannot be trusted by the reader as the information the narrator provides is false or not completely true either because the narrator lies on purpose or because he/she is insane, naive or similar and therefore does not provide the reader accurate information. This type of narrator usually surprises readers because the reader always expects the voice, character or entity that tells the events in the story is trustworthy or authoritative but in the case of a reliable narrator the readers should try to identify which events can be believed and which ones are not accurate. Thus, unreliable narrators are startling because readers expect the storyteller to be authoritative.

to inform the reader that the text will take a second look at the grimms’ original tales

i believe the answer is d : )