Final answer:
The option with a correctly used subordinate clause for sentence 8 is option (c), which uses 'Because' to explain why Shakespeare would have been familiar with 'The Spanish Tragedy.'
Step-by-step explanation:
Among the given options for revising sentence 8, the one that correctly uses a subordinate clause is option (c): "Because it was the most famous English play in this tradition, The Spanish Tragedy by Thomas Kid would have been familiar to Shakespeare."
This revision introduces a subordinate clause starting with "Because," providing a reason why Shakespeare would have known the play, thereby adding depth to the sentence structure.
The correct revision of sentence 8 is option d: Shakespeare would have been familiar with Thomas Kyd's The Spanish Tragedy, the most famous English play in this tradition.