Correct option is D.
Lectures are considered as the genre that would most likely be used to educate a large group of people. Lectures are educational talks or long speeches.
A lecture is a talk given on a certain subject or a reprimand given after someone does something wrong. A lecture on natural sciences is an example of a discussion. A parent giving a youngster a lecture about being truthful after the child has lied is an another example of lecture.
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