Final answer:
The subject of this question is English at a High School grade level. In the given context, Marcus arrives first and gives someone a friendly greeting with a kiss.
Step-by-step explanation:
The subject of this question is English and it is at a High School grade level.
In the given context, the word 'Marcus' in the sentence refers to the subject of the question. Marcus arrives first and gives someone a friendly greeting with a kiss. The specific person or entity receiving the greeting is not mentioned, so it is left blank in the question. The sentence implies that Marcus greets someone in a friendly manner by kissing them.