Once upon a time there was a pink duck who ate bread.
The end.
Uniquely among the arts, theatre focuses on one thing and one thing only. this one thing is Humans beings. This is further explained below.
<h3>What is theatre arts?</h3>
Generally, Acting out tales in front of an audience via the use of words, gestures, music, dance, sound, and spectacle is what theatre is all about.
In conclusion, Theater is one of the few artistic disciplines that concentrate only on a single aspect of performance. The most important thing in the world is people.
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To me, I know of Williams through films like Star Wars and Jurassic Park, the latter directed by Spielberg. So, the answer would be A!