The sentence that summarizes the problems between Sam and Guy when they start to share a room is A. Sam is selfish about his belongings
This refers to the disagreements that exist between two or more people where they have a constant struggle with each other.
Hence, we can see that from the complete question, there is the narration of the way in which Sam and Guy were roommates and how they both struggled to adapt because of Sam's selfishness.
Read more about conflicts here:
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