Concept:Grammatical error detection requires checking subject-verb agreement, preposition usage, and logical flow.
Explanation:Part (a) "The guidance from the mentors" uses the correct subject phrase with proper preposition "from".
Part (b) "and teachers facilitated the" correctly connects with "and" and uses the past tense verb "facilitated" that agrees with the singular subject "guidance".
Part (c) "smooth conduct of elections to the Students' council" uses appropriate article, preposition "of" and "to", and correct possessive "Students'".
All parts form a grammatically correct and semantically logical sentence.
No error in subject-verb agreement, tense, or word choice.
Answer:(d) No error