Final answer:
The main conflict in 'The Cactus' is Trysdale's love for himself vs his love for his intended, which leads to a realization that his pride has cost him the relationship.
Step-by-step explanation:
The main conflict in "The Cactus" revolves around the character Trysdale and his own pride and assumptions. The narrative centers on Trysdale’s self-admiration and his lack of understanding of his intended. The correct choice among the given options is B: the conflict is Trysdale’s love for himself versus his love for his intended. As the story progresses, we see that Trysdale is too preoccupied with his own accomplishments and ego to appreciate the depth of his relationship with his intended, ultimately leading to a personal revelation that his pride has cost him dearly.