Which is the correct plural form of “phenomenon”?

The correct plural form of "phenomenon" is "phenomena." This is an important distinction in English, as it follows a specific pattern of pluralization typically found in Greek-derived words. "Phenomenon" is a term used to describe observable events or occurrences, and when referring to multiple instances or types of these events, the proper term is "phenomena."

The other choices do not adhere to standard English grammar rules or etymology. "Phenomenae" appears to be a misinterpretation of the Latin pluralization format, while "phenomenons" is a non-standard, less accepted form in formal writing, and "phenomenum" is a misspelling. Understanding these distinctions is crucial for effective communication and academic writing.