Final answer:
The best summary of the passage is option A), which highlights Dorothy L. Sayers as an Oxford graduate and versatile writer in post-war England.
Step-by-step explanation:
The best summary of the passage is option A) Among the first females awarded a degree from Oxford University, Dorothy L. Sayers proved to be one of the most versatile writers in post-war England. This summary encapsulates Sayers's accomplishment as one of Oxford's first female graduates and her versatility as a writer in post-war England, which covers both her academic achievements and her writing career.
The option effectively summarizes the various aspects of Sayers's life and work mentioned in the passage, from her early education and pioneering degree, to her literary contributions in detective fiction, translations, religious plays, and essays, without dwelling on specifics that the other options do.