The counsellor said, "If I had known about the student's difficulties earlier, I would have intervened." Choose the correct indirect form:
A.
The counsellor said that if she knew about the student's difficulties earlier, she would intervene.
B.
The counsellor said that if she had known about the student's difficulties earlier, she would have intervened.
C.
The counsellor said that if she has known about the student's difficulties earlier, she would have intervened.
D.
The counsellor said that if she had known about the student's difficulties earlier, she will have intervened.