The correct answer is A. The opening act of the Shakespearean play began at sundown at Zilker Hillside Theater.
Step-by-step explanation:
In grammar, capitalization should be used in the first word of a text or paragraph and in proper nouns that include names of specific places, companies, mountains, river, etc in which all the words that are part of the noun should be capitalized for example the Pacific Ocean or Louvre Museum. Additionally, words that derivate from proper nouns including adjectives such as Italian, American or Shakespearean should be capitalized. This means, in the case of the sentence presented the word "The" that is the first word, the word "Shakespearean" that derives from the proper noun Shakespeare and the words "Zilker Hillside Theater" that formed a proper noun should be capitalized and therefore the sentence with the correct capitalization is "The opening act of the Shakespearean play began at sundown at Zilker Hillside Theater".