Choose the most appropriate option to fill in the blank.I have been t…

The correct answer is Option (3) → nevertheless

Note: The given answer is as per the official NTA Answer Key. However, more than one answer is possible here: Option (3) "nevertheless" and Option (4) "although" both make a correct sentence, as explained below.

Option 1: so — Incorrect. So introduces a result; wanting to go again does not follow from having gone four times.
Example: It was raining, so we stayed at home.

Option 2: and — Incorrect. And only adds one idea to another; it does not show the contrast that "still" points to.
Example: She sings and dances well.

Option 3: nevertheless — Correct (Answer as per NTA).

• Nevertheless means in spite of that; it introduces a statement that is surprising after what has just been said.
• Clue word: "still", which shows that the second part holds in spite of the first.
• This sentence: after four visits this year one might not want to go again, yet the speaker would not mind going. The second part holds in spite of the first, so the link is nevertheless.
  Example: The road was flooded; nevertheless, the bus reached on time.

Option 4: although — Can also be considered as correct. Although means in spite of the fact that. After a comma it can introduce a clause that adds a contrasting point, so "I have been to the Hanging Garden four times this year, although I still wouldn't mind going there again" is normal English. Strictly, "nevertheless" is an adverb, not a joining word, so with only a comma before it the sentence is a comma splice; a semicolon is needed: "...this year; nevertheless, I still ...".
Example: I enjoyed the film, although it was a little long.

Complete sentence: I have been to the Hanging Garden four times this year, nevertheless I still wouldn't mind going there again.