ECAT Engineering Exams Quizzes MCQs Quizzes ECAT Engineering Entry Test 2017 English Spotting Errors 5

Question:
He could not plan his strategy
(A)until he knew
(B)whom his opponents could be
(C)No error

Option A):
(B)
Option B):
(C)
Option C):
(A)

Correct Answer is Option B):
(C)