A group of words together makes phrases. 'That' is the sentence that refers to the description of the mantenhas as it gave Aisha an idea.
What are mantenhas?
Mantenhas are the spoken words and messages that were delivered to the loved ones and the relatives of the distant family members. They were either written on paper dropped in bottles or were spoken in words by someone who traveled.
This idea felt amusing to Aisha as mantenhas were a creative way to know about connections of the members who lived far away and was a good way to send greetings.
Therefore, 'that' refers to the description of the mantenhas.
Learn more about incomplete phrases here:
https://brainly.com/question/21237294
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