A subject is the one being discussed in the sentence. In the question about, Who functions as the subject. It is the receiver of the action-- <em>left a pair of mittens on the ground. </em>The direct object is the <em>pair of mittens</em>. It's not possessive because it's not asking about ownership. <em>Park </em>is the object of the preposition.
ANSWER: A
Queen Elizabeth I succeeded at her sister Queen Mary I.
