Concept:The articles of faith are the core beliefs required of every Muslim. One option listed is not one of these core beliefs.
Explanation:The articles of faith in Islam include belief in Allah, His angels, His books, His messengers (prophets), the Day of Judgment, and divine decree.
Prophets and angels are clearly part of these articles of faith.
An imam is a religious leader or prayer leader, not an essential article of faith.
Therefore, belief in an imam is the exception among the given options.
Answer:B. imam