English ECAT Exams Quizzes MCQs Quizzes English ECAT Spotting Errors Online Test 5

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

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

Correct Answer is Option A):
(C)