In which one of the following sentences is the simple subject also the complete subject? a. cory drove to middleton in his search for eloise. b. crocodiles, quiet as logs, lurked on the riverbank. c. detectives homer fry and janine small looked high and low for clues. d. large and small dinosaurs stalked the grassy plains

The correct answer is A. Cory drove to Middleton in his search for Eloise.
A simple subject is one which consists of only one word - here, the subject is Cory, and as you can see, it has only one word. A complete subject contains everything that refers to the subject (adjectives, appositives, etc). Since there are no such modifiers describing the word Cory, that is also the complete subject.
B is incorrect because the subject is 'crocodiles, quiet as logs.' C is incorrect because the subject is 'detectives Homer Fry and Janine Small.' D is incorrect because the subject is 'large and small dinosaurs.'

In which one of the following sentences is the simple subject also the complete subject? A. Cory drove to Middleton in his search for Eloise.