Select the most appropriate option to fill in the blank.

______ I learned that there was a gift for each child, I was delighted.

When

The most appropriate option to fill in the blank is When.

The sentence is about how the speaker was delighted when they learned that there was a gift for each child. The word "when" is used to introduce a time clause, which is a clause that tells us when something happened. In this case, the time clause is "when I learned that there was a gift for each child."

The other options are not as appropriate.

• Though means "although" or "even though." This does not make sense in the context of the sentence, because the speaker was not delighted despite learning that there was a gift for each child, they were delighted because of it.
• While means "during the time that" or "at the same time that." This does not make sense in the context of the sentence, because the speaker was not delighted while they learned that there was a gift for each child, they were delighted after they learned it.
• Which is a relative pronoun that is used to introduce a clause that describes something. This does not make sense in the context of the sentence, because we are not describing the gift for each child, we are talking about the speaker's reaction to the gift.