How did the Congress party's political success change in the early 1970s?

1) It became less dependent on attracting people based on divisions.
2) It focused on accommodating leaders of different ideologies.
3) It relied on appealing to multiple leaders within the party.
4) It attracted people based on sharp social and ideological divisions and the appeal of one leader, Indira Gandhi.

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Answer: It attracted people based on sharp social and ideological divisions and the appeal of one leader, Indira Gandhi.
In the early 1970s, the Congress's political success depended on attracting people based on sharp social and ideological divisions and the appeal of one leader, Indira Gandhi.

But was it only a case of return of Indira Gandhi? Between the elections of 1977 and 1980 the party system had changed dramatically. Since 1969, the Congress party had starting shedding its character as an umbrella party which accommodated leaders and workers of different ideological dispensations and view points. The Congress party now identified itself with a particular ideology, claiming to be the only socialist and pro-poor party. Thus with the early nineteen seventies, the Congress’s political success depended on attracting people on the basis of sharp social and ideological divisions and the appeal of one leader, Indira Gandhi. With the change in the nature of the Congress party, other opposition parties relied more and more on what is known in Indian politics as ‘non-Congressism’. They also realised the need to avoid a division of non-Congress votes in the election. This factor played a major role in the elections of 1977.