Mastery of grammatical rules are mandatory for students and teachers as well as authors.
  • a)
    Mastery of grammatical rules are mandatory for students and teachers as well as authors. 
  • b)
    Mastery at grammatical rules is mandatory for students and teachers as well as authors. 
  • c)
    Mastery at grammatical rules are mandatory for students and teachers and authors. 
  • d)
    Mastery of grammatical rules is mandatory for students and teachers as well as authors. 
Correct answer is option 'D'. Can you explain this answer?

GMAT Question

By Siddharth Raman · 2 weeks ago ·GMAT
Prasanta Das answered Mar 11, 2019
Mastery is singular, so 'is' verb is appropriate. Mastery of is the correct idiom.

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