The crisis of democratic order

Read the passage and answer the questions below:
Indian democracy was never so close to a two-party system as it was
during the 1977 elections. However, the next few years saw a complete
change. Soon after its defeat, the Indian National Congress split into
two groups……….. … … …The Janata Party also went through major
convulsions…..David Butler, Ashok Lahiri and Prannoy Roy. — Partha
Chatterjee
(a) What made the party system in India look like a two-party system in
1977?
(b) Many more than two parties existed in 1977. Why then are the
authors describing this period as close to a two-party system?
(c) What caused splits in Congress and the Janata parties?