To determine the correct synonym for "dirty" based on its connotation in the excerpt, we need to consider the context in which the word is used. If "dirty" is referring to cleanliness, then "unwashed" (B) would be appropriate. If it suggests moral impurity or unethical behavior, then "dishonorable" (D) would fit better. If it implies something that has been spoiled or tainted, then "contaminated" (C) would be the best choice.
Without the specific context of the excerpt, it's hard to pinpoint the precise synonym, but if you clarify the context in which "dirty" is used, I can help narrow it down further!