If a High Court in India Does Not Give the Certificate

If a High Court in India does not give the certificate to a case that it involves a substantial question of law, the Supreme Court:

A) can never hear the case
B) does not enter into the picture
C) may hear the case if it is satisfied that the case involves a substantial question of law as to the interpretation of the Constitution
D) may hear the case if the President calls upon it to do so