Explanation:

 The Congress rejected the offer of the Muslim League to form a joint government because it had won an absolute majority in the united Provinces. Moreover, the Congress had rejected the Muslim League’s proposal for the coalition government partly because the Congress wanted to abolish landlordism although the party had not taken any concrete steps in this direction. On the other hand, the Muslim League tended to support landlordism. Most importantly, the Congress had not achieved any substantial gains in the "Muslim mass contact" programme it launched.