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

The correct answer is Option (1) → The little

Little, a little and the little:

• Little = hardly any (a negative sense).
• A little = some, a small but useful amount.
• The little = the small amount that there is, all of it; used when the amount is a particular one.
• Deciding clue: the clause "that you have saved", which makes the money a particular amount.
• This sentence: the money is a particular amount, fixed by the clause "that you have saved", and the speaker means all of that small amount, so "The little" is needed.
• Complete sentence: The little money that you have saved should not be spent on a grand wedding.
  Example: The little water left in the bottle was given to the child.

Why the Other Options are Incorrect?

Option 2: Little — Incorrect. "Little" alone means hardly any and is used for a general amount; it cannot point to the particular money that was saved.
Example: There is little hope of rain today.

Option 3: A little — Incorrect. "A little" means some and is indefinite; "a little" cannot point to the particular money fixed by "that you have saved", which needs "the".
Example: Add a little salt to the soup.

Option 4: More — Incorrect. "More" means a greater amount and needs a comparison, which the sentence does not have.
Example: I need more time to finish this.