SAT Question c088a9a9: Command Of Evidence answer and explanation

English - Command Of Evidence - Hypothetical Finding Supports
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Over the course of the 1900s, more and more Native Hawaiians spoke English instead of the Hawaiian language. To preserve their language, Native Hawaiian teachers founded the ‘Aha Pūnana Leo preschool in 1984. They spoke Hawaiian while teaching, and their Native Hawaiian students were soon able to understand and speak it themselves. The school was a huge success. Eventually it opened locations around Hawai‘i and started teaching Hawaiian to elementary and high school students too. Thanks to ‘Aha Pūnana Leo, the number of young people who speak the language has increased.
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Difficulty:Easy
Which statement, if true, would most directly support the underlined claim?