Difficulty: Easy
Correct Answer: phenomena
Explanation:
Given data
Concept/Approach
Phenomenon (singular) → phenomena (plural). After "one of the most …", the head noun must be plural.
Option analysis
B. "phenomena" → correct plural form. ✔A → singular; wrong after "one of the …".C/D → non-words.E → retains incorrect "phenomenons".
Final Answer
phenomena
Discussion & Comments