Step 1: Understand the question.
We must put four events of early Indian politics in order of time, earliest first. So we need one year for each event.
Step 2: Find the year of each event.
Formation of the Socialist Party: 1948. Formation of the Bharatiya Jana Sangh: 1951. Third General Elections: 1962. Split in the Communist Party of India: 1964.
Step 3: Build the sequence.
Earliest is (D) 1948, then (B) 1951, then (A) 1962, then (C) 1964. So the order is (D), (B), (A), (C).
Step 4: Check option 1: (B), (D), (C), (A).
This puts the Jana Sangh (1951) before the Socialist Party (1948), and the CPI split (1964) before the Third General Elections (1962). Both are wrong, so option 1 is wrong.
Step 5: Check option 2: (B), (C), (D), (A).
This starts with the Jana Sangh and puts the 1964 split before the 1948 Socialist Party. That breaks the time order, so option 2 is wrong.
Step 6: Check option 3: (D), (A), (B), (C).
It starts correctly with (D), but it puts the 1962 elections before the 1951 Jana Sangh. So option 3 is wrong.
Step 7: Check option 4: (D), (B), (A), (C).
This matches 1948, 1951, 1962, 1964 exactly. So option 4 is correct.
Final Answer:
The correct order is Socialist Party (1948), Jana Sangh (1951), Third General Elections (1962), CPI split (1964). This is option 4.
\[ \boxed{\text{Option 4: (D), (B), (A), (C)}} \]