Concept:The word 'ascend' means to move upward, while its antonym must convey downward movement.Explanation:'Ascend' refers to going up or rising, physically or metaphorically. Its direct opposite is 'descend', which means to move downward or lower.Let us examine the options: 'Rise' and 'Soar' and 'Climb' all mean moving upward, so they are synonyms of 'ascend', not antonyms.'Descend' is the only word that means moving downward, making it the correct antonym.Answer:Descend (Option D)