Given below is a question followed by two statements numbered I and II, each containing some information. Decide which of the statement(s) is/are sufficient to answer the question.
Question: On which day of the week did Madan visit Bangkok?
Statements:
I. Madan took leave on Wednesday.
II. Madan visited his brother on Friday, the previous day of his visit to Bangkok.

Question: On which day of the week did Madan visit Bangkok?

Statement I: Madan took leave on Wednesday.
→ This does not tell on which day he visited Bangkok. Not sufficient.

Statement II: Madan visited his brother on Friday, the previous day of his visit to Bangkok.
→ If Friday was the previous day, then Madan visited Bangkok on Saturday.
→ This statement alone answers the question. Sufficient.

logic
Statement II alone is sufficient, while Statement I alone is not sufficient.

explanation
Only Statement II gives a direct relation between a known day (Friday) and the day of visit.

Thus, correct option is (d).