Identify the interjection in the sentence. Terrific! They finally get to the mountains, but they have no map or cell phone!

________ sources are books and articles that synthesize material from ________ sources, framing them for general readers

A) Primary; secondary B) Secondary; tertiary C) Tertiary; primary D) Primary; tertiary E) Tertiary; secondary

He is the ________ of the two brothers and the ________

A) younger/friendliest B) younger/friendlier C) youngest/friendlier D) youngest/friendliest