Select the correct answer. Which theme is reflected in this excerpt from "The Adventure of the Speckled Band" by Sir Arthur Conan Doyle?

"It is a swamp adder!" cried Holmes; "the deadliest snake in India. He has died within ten seconds of being bitten. Violence does, in truth, recoil upon the violent, and the schemer falls into the pit which he digs for another. Let us thrust this creature back into its den, and we can then remove Miss Stoner to some place of shelter and let the county police know what has happened."

A.

the dangers of biased thinking

B.

cruelty toward animals

C.

the value of kindness

D.

crime backfires on a criminal

E.

the importance of seeking help