The option B is true because an artist who places a row of trees extending from the lower left side to the upper right in a painting helps to achieve unity by continuation.
What is continuation?
Continuation is the action of carrying something out over a period of time. The continuation of something is the fact that it continues, rather than stopping.
Something that is a continuation of something else is closely connected with it or forms part of it.
Thus, because the artist is placing the row of trees extending from the lower left side to the upper right in a painting will help him to achieve unity by continuation. Hence, option B is true.
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