Choose the appropriate word from the given options to complete the fo…

The correct answer is Option (1) → Although

Conjunction of contrast:

• Although joins two clauses that show contrast (concession): the main action happens in spite of what the "although" clause says.
• This sentence: she hated long walks, yet she went with her father to please him. The two facts pull in opposite directions, so "although" joins them.
• Complete sentence: Although she hated to go out for long walks, she went with her father just to please him.
  Example: Although it was raining, the match went on.

Why the Other Options are Incorrect?

Option 2: Once — Incorrect. As a conjunction, once means as soon as or after; it shows time, not contrast, and "Once she hated to go out ..." does not fit the second clause.
Example: Once the meeting ended, everyone left the hall.

Option 3: As — Incorrect. As introduces a reason ("because") or time ("while"). Her dislike of long walks cannot be the reason she went for one.
Example: As it was late, we took a taxi home.

Option 4: Because — Incorrect. Because gives a reason. Hating long walks is not why she went with her father, so the sentence would contradict itself.
Example: She stayed at home because she was unwell.

Contrast: "although" shows a contrast; "because" and "as" give a reason, and "once" shows time.