Final answer:
The correct sentence is B. 'We went to the zoo; therefore, I am an expert on penguins.'
Step-by-step explanation:
The correct sentence is B. 'We went to the zoo; therefore, I am an expert on penguins.' The use of a semicolon before the word 'therefore' correctly separates two independent clauses. The comma after 'therefore' indicates a pause for clarity in the sentence. It is important to use punctuation correctly to convey meaning and improve the readability of the text.
Learn more about Punctuation in English sentences