Discussing the surprisingly high percentage of cancers caused by secondhand smoke would most likely be an example of which attention-getting technique?

The correct answer is: Shocking or Horrifying the listeners.

Explanation:

Attention getting techniques can be defined as the sentences or information used in speeches during a verbal communication that will draw the attention of all the listeners towards the speaker. In the given question, when speaker talks about the incidence of cancer in the second hand smokers who are also called the passive smokers, it alarms the listeners. This is because according to the speaker's statement the people who are not addicted to smoking possess substantial risk of developing cancer due to passive smoking. This raises curiosity and alarm among the listeners and they are keen and eager to get more update on the the subject of cancer development. This way the speaker can prove himself to be a good orator.