The correct options are
B Political parties questioned the legitimacy of the Indian Constitution.
C The Constituent Assembly was elected by direct election.
D The Constituent Assembly did not have enough geographical representation.
Due to the absence of universal adult franchise, the members of the Constituent Assembly were not directly elected by the people. The Constituent Assembly was elected mainly by the members of the existing Provincial Legislatures, not direct election. Princely states had also nominated members to the Constituent Assembly. It had sufficient geographical representation. No political party has ever questioned the legitimacy of the Constitution.