The correct option is A 43 seats
The Communists had indeed been a major stakeholder in India long before Independence. After India won its freedom, they were the opposition in 1952 and both the undivided Communist Party and later the CPI and CPI(M) had some of the best Parliamentarians the country has seen. In the first general elections in 1967 - after its split with the parent CPI - the CPI(M) had won 19 seats out of the 59 it contested and by 1971, it had raised it to 25 out of which 20 were from West Bengal alone. By 1980, it had about 30 seats and in 2004, it went up to an all-time high of 43. Hence, Option A is correct. The rest of the numbers were the seats they won in other elections, hence, incorrect.