Read the given events and select the option that is the most appropriate explanation for them.

Events:

A: Suraj died on his way to office.

B: Suraj had been feeling depressed since a month regarding the loss of his spouse.

The Relationship between Events:

Event A: Suraj died on his way to the office (effect).
Event B: Suraj had been feeling depressed for a month due to the loss of his spouse (possible cause).
Identifying the Cause-and-Effect Relationship:
Event A (death) could be linked to Event B (depression), but depression does not necessarily lead to immediate death.
There could be other causes (accident, health issue, etc.), so Event B is not the immediate and principal cause of Event A.

Thus, the correct option is (b) Event A is an effect but Event B is not its immediate and principal cause.