The Shimla Conference was called to discuss

a) Rajaji formula
b) Wavell Plan
c) Cabinet mission plan
d) Dickie bird plan

Ans-[B] 

Explanation- It was called to discuss Wavell plan.
When Wavell became viceroy his most important task was to present a formula for thefuture government of India which would be acceptable to both Congress and the Muslim League. Main points of the plan were :

1. If all the Indian political parties would agree to help the British war effort, then the British Government would introduce constitutional reforms in India after the war and the Executive Council would be immediately reconstituted with number of its members increased.

2. All the members of the Council, except the Viceroy and the Commander-in-Chief, would be Indians.

3. The defence of India would remain in British hands until power was ultimately transferred to Indians.

4. The Viceroy would convene a meeting of Indian politicians including the leaders of Congress and the Muslim League at which they would nominate members of the new Council.

CR Formula was a proposal for the Congress to offer the Muslim League, the Pakistan, based on plebiscite of all the peoples in the regions where Muslims made a majority.

Proposal of Dickie bird plan was that provinces should become first independent successor states rather than an Indian Union or the two dominions of India & Pakistan.