Event B (India winning the second test) is the immediate and principal cause of Event A (retaining the same players). The selectors likely decided to keep the winning team together because they performed well and achieved a positive result.
Let's look at why the other options aren't suitable:
The correct answer is (A) : If 'A' is the effect and 'B' is its immediate and principal cause.
Statement:
In a village there are 1200 voters. The number of female voters is more than 50%.
Conclusions:
I. The village has 600 female voters.
II. Female voters are the majority in the village.