In the painting the races, the artist edouard manet used heavy dark lines to suggest the shapes of people in a crowd in order to a demonstrate the crowd's boredom b emphasize the importance of the spectators to the composition c add to the fast-paced, spontaneous feel of the composition d create a feeling of gloom and dread

the sculpture i am pretty sure you are talking about is the statue b. the david statue now lives in the galleria dell'accademia, florence, italy. it was made by ‎michelangelo.

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artists need to create a realistic interpretation so that people in general can relate to the artwork. for a common people, an artist's impression gets increased only if he can create something which would look realistic. an abstract is difficult for a common people to understand whereas if a person can draw a girl with simple pencil sketch and if that looks like a real figure then the latter will be praised more than the former.