Multiple choice softskills leadership deleterious harmful make watertight (by blocking up cracks as in a ship) reluctant student of the history and science of humankind Reveal answer Fill a bubble to check yourself A Correct answer Explanation Deleterious means causing harm or damage, making 'harmful' (A) the correct answer. The other options are unrelated - caulk means seal cracks, reluctant means unwilling, and an anthropologist studies human cultures.