Which letter corresponds to the answer "O"?

The answer is "B. Omicron" because Omicron is the Greek letter that corresponds to the English letter "O." In the Greek alphabet, each letter has a unique name and symbol, with Omicron being specifically recognized for representing the sound "o."

Other options, such as Xi, Lambda, and Iota, represent different sounds and letters in the Greek alphabet. Xi corresponds to the sound "ks," Lambda corresponds to "l," and Iota corresponds to "i." Understanding the basic structure of the Greek alphabet helps in identifying which letter matches certain English letters, such as how Omicron directly aligns with "O."