Choose the appropriate conjunction

Even is the correct conjunction emphasizing contrast in he does not know despite being told. This question tests conjunction knowledge. In spite requires of and while suggests simultaneity both unsuitable. Even though fits the context of repeated explanation. Understanding conjunctions ensures coherent sentence structure. This phrase is common in expressing frustration or surprise. Correct usage clarifies reasoning in writing or speech. Knowing even though enhances communication precision vital for professional or academic settings ensuring clear expression of contrasting ideas in essays reports or conversational contexts.