Imade her other morse code jewelry with dad’s messages — a necklace, an anklet, some dangly earrings, a tiara — but the bracelet was definitely the most beautiful, probably because it was the last, which made it the most precious. explain the ambiguity of the boldfaced text.

There's a clear ambiguity on the text regarding the jewelry and the messages.

The narrator is talking about how it was made jewelry with the father's message with Morse code but the phrase is as follows:

"[...] with Dad's messages - a necklace, an anklet, some dangly earrings, a tiara - but the bracelet was definitely the most beautiful, probably because it was the last"

You cannot say for sure if the last that is referred on the text is that the last message or if it is because it's the last jewelry.

It can either be the last message that makes it to be the most precious or because it was the last jewelry made. The pronoun "IT" can be referring to either.

That is the ambiguity

It is not clear whether the narrator is talking about the last piece of jewelry he made or the last message his Dad left. The bracelet was the most beautiful because it was made after practice with the other pieces. The bracelet was the most beautiful because it represented his dad’s last words.

d. football allowed the narrator and his father to reconnect after his parents' divorce.