Based on the passage, the two appropriate options that reflect the change in interactions between characters are:
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The conflict between Cassius and others is becoming strained. - Brutus's observation about Cassius cooling as a friend indicates that there is a tension or conflict that is affecting their relationship.
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Brutus says Cassius is pretending to be friendly. - Brutus's remarks about "hollow men" and "enforced ceremony" suggest that he perceives Cassius's friendliness as insincere or superficial, implying that he believes Cassius is not being genuine in his interactions.
These options highlight the evolving dynamics in their relationships as they navigate conflict and trust.