Which is the correct way to punctuate the sentence?

dr. burke wanted to trust her assistant with the secret formula; but she was afraid her assistant was a spy.
dr. burke wanted to trust her assistant, with the secret formula: but she was afraid her assistant was a spy.
dr. burke wanted to trust her assistant with the secret formula but, she was afraid her assistant was a spy.
dr. burke wanted to trust her assistant with the secret formula, but she was afraid her assistant was a spy.

you can earn the crowns by answering others questions an being selected brainliest if your answer is the best.

good luck: )

what are you asking? this is gibberish.

we would need to be able to read the passage in question to determine which factor allowed david believe he could defeat goliath. post the passage, and i'd love to out.

the tale of “aunty misery” written by judith ortiz cofer , is a folk tale about an old woman who earns immortality by tricking death . the cost of immortality however, is that her life will stay the same. from this tale it becomes clear that death is a necessary evil and is inevitable in life.  

question: which theme is found in the tale of "aunty misery? ”

answer: a. death may not seem friendly, but he should be treated kindly.