Concept:The word "ambiguous" means unclear or having more than one interpretation.Its most direct opposite is "clear", which means easy to understand.Explanation:The sentence uses "unlike you" to show a contrast between the speaker and the other person.If the other person found the message "ambiguous", then the speaker found it easy to understand.Therefore, the word that best fills the gap is "clear".The other options do not express the direct opposite of "ambiguous".Answer:B. Clear