Concept:These three words sound similar but have different meanings: lesion (a wound), legion (a large group), lesson (a teaching) or lessen (to reduce).Explanation:Sentence 1 uses 'lesion' correctly to mean a dangerous tissue change.Sentence 2 uses 'legion' correctly to mean a huge number of followers.Sentence 3 uses 'lesson' incorrectly. The correct word should be 'lessen', meaning to reduce the burden.Thus only sentences 1 and 2 are correct.Answer:A. 1 and 2 only