What phonetic term corresponds to the letter "O"?

The phonetic term that corresponds to the letter "O" is "Oscar." This term is part of the phonetic alphabet, commonly known as the NATO alphabet or the International Radiotelephony Spelling Alphabet. It is used to clearly communicate letters over radio or telephone transmissions, especially in contexts where clarity is critical, such as in aviation and maritime communication. "Oscar" is widely recognized and used for identifying the letter "O" to avoid miscommunication that might occur due to similar-sounding letters or interference.

In contrast, the other choices, while they may be associated with the letter "O," are not officially recognized phonetic terms used in this standardized alphabet. Therefore, they would not serve the intended purpose of providing clarity in communication.