⏺heya friend !
✔here's your answer :-
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➡although all the options are essential for a presentation to be strong , yet the most probable option is - c) clearly convey ita purpose.
➡because a presentation will be effective only if it clearly conveys its purpose and its effect on audience is long lasting.
➡entertainment, facts and data are something which can be quickly forgotten but if the purpose is clearly conveyed , then it will not be forgotten quickly and it wil be a strong presentation.
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i hope it helps u !!!☺
