The correct answer is 1. Tell a story about rappelling into a cavern that can't be reached any other way.
Explanation:
In speeches, an attention-getters refers to different techniques including t jokes, stories, quotes, etc. used at the beginning of speeches to grab the attention of the audience and engage them to listen to the whole speech. Because of this, attention-getters need to be interesting and present the topic in a positive way, also, these do not need to explain the content of the speech or be too formal. Considering this, the best attention-getter if the topic is to encourage people to take up rappelling is "Tell a story about rappelling into a cavern that can't be reached any other way", because this story based on personal experience is interesting and linked to the main purpose of the speech, which makes it a perfect attention-getter. Also, this is the only option that presents the topic in a positive way without explaining it and therefore is ideal to engage the audience.
