Select the most appropriate option to fill in the blank.
She was eager to embark on an evening excursion, _____ the torrential downpour rendered it utterly impractical.

Correct option is A

The correct option to fill in the blank is (a) but.

Explanation:
The sentence presents a contrast between the woman's eagerness to go out and the rain making it impossible. 'But' is the coordinating conjunction used to introduce a contrasting idea.

Example: He wanted to buy the car, but he didn't have enough money.

Information Booster:
Use 'and' for addition, 'but' for contrast, 'so' for result, and 'because' for reason.

So the correct answer is (a)