Step 1: Analysis of Statement (A)
Statement (A) is incorrect. In the 1989 Lok Sabha elections, the Congress party won fewer seats compared to the 1984 elections. In 1984, Congress had a landslide victory, securing a record number of seats.
Step 2: Analysis of Statement (B)
Statement (B) is incorrect. The 1991 elections did not mark the end of the 'Congress system'. While the Congress party lost some support, it continued to play a significant role in Indian politics until the 1990s. The end of the 'Congress system' is often attributed to the 1996 elections.
Step 3: Analysis of Statement (C)
Statement (C) is correct. In the 1989 elections, the Congress party suffered a major defeat, but no other party secured an absolute majority. This led to a period of coalition governments in India.
Step 4: Analysis of Statement (D)
Statement (D) is also correct. The National Front, a coalition of several parties including the Janata Dal, formed a government in 1989, with V.P. Singh as the Prime Minister.
Step 5: Final Answer
Therefore, the correct answer is (D) (C) and (D) only.