What sentiment is expressed regarding friendship and agreement?

The sentiment expressed in the correct answer highlights a strong commitment to support and loyalty to a friend, regardless of any personal differences or disagreements that might arise. By saying, "I'd be on your side even if you weren't my friend," the speaker emphasizes that their support is not contingent on friendship; rather, it speaks to an intrinsic value in standing by someone's beliefs or actions, irrespective of the relationship status. This notion suggests a depth of loyalty that transcends friendship, indicating that the speaker's principles of support and agreement would remain firm even in the absence of a personal connection.

The other options suggest conditions where the speaker's support, agreement, or loyalty is influenced by the existence of friendship. Some imply disagreement or opposition if the friendship were not present, which contrasts with the unwavering support expressed in the correct answer. This difference clarifies the sentiment as one of unconditional support that is particularly strong in the context of friendship but doesn’t depend on it.