The correct option is D avoid
Tackle means make determined efforts to deal with (a problem or difficult task). The opposite of tackle is avoid, or keep away from or stop oneself from doing (something).beneficial. Hence, Option C is correct. Among the rest of the options, oppose means fail to notice, overlook means fail to notice, appease means pacify or placate (someone) by acceding to their demands.These do not express this antonym, hence incorrect.