​Without assuming anything beyond the information given, select the correct nature of relationship between the two events A and B.
Event A: Ronit went to the dentist.
Event B: Ronit had a toothache.

Let's analyze the relationship between the two events:

Event A: "Ronit went to the dentist."

Event B: "Ronit had a toothache."

Generally, a person visits a dentist because they have a dental issue, such as a toothache.

Event B (Ronit had a toothache) is the cause, and Event A (Ronit went to the dentist) is the effect.

Since the toothache directly led to Ronit's visit to the dentist, Event B is the immediate and principal cause of Event A.

Thus, the correct option is  (d) Event A is the effect and Event B is its immediate and principal cause.