Fill in the blank in the following sentence with the most appropriate…

The correct answer is Option (4) → Although

Complete sentence: Although his mother is a celebrated lawyer, he chose a career in finance. One would expect the son of a celebrated lawyer to choose law, yet he chose finance. The two facts contrast, so "Although" fits.

Option	Meaning and use	Example
(1) Unless	Unless means if not and sets a condition. The mother's career is a fact, not a condition.	You cannot enter unless you have a pass.
(2) Since	Since here would give a reason: the mother being a lawyer would become the reason for choosing finance, which makes no sense.	Since it was late, we took a taxi.
(3) Because	Because also gives a reason, while the sentence needs a contrast.	He stayed at home because he was ill.
(4) Although (answer)	Although joins two clauses whose ideas contrast: the second is true in spite of the first.	Although it was raining, the match went on.