(b) 2 only
The results of the first general election did not surprise anyone...Congress party won 364 of the 489 seats in the first Lok Sabha and finished way ahead of any other challenger. The Communist Party of India that came next in terms of seats won only 16 seats.
So, statement 1 is wrong
In the remaining options b and c, both contain statement 2, so as such we've to accept it as true, and no need to waste time finding proofs, Nonetheless, to satiate the curiosity.
It was Ram Subhag Singh- who became the first leader of opposition in Lok Sabha in 1969. Ref: Indian Express
In each House of Parliament, there is the 'Leader of the Opposition'. The leader of the largest Opposition party having not less than one-tenth seats of the total strength of the House is recognized as the leader of the Opposition in that House. maximum strength of the Lok Sabha is fixed at 552 so minimum 10% doesn't translate to 75 in any case.
Hence statement 3 is wrong, by elimination, we get Answer (b).