Read, translate and match the examples (1-4) and the techniques (a-d)

The introductory paragraph is a special paragraph in an essay. It has two main purposes: to introduce the topic and attract the reader's attention and interest. Look at the examples below, guess and say which technique has been used to attract the reader's attention and interest?
1 Some scientists believe that the ozone layer over Antarctica is 10% smaller.
2 Are you aware of the fact that your child spends 6 hours a day in front of the computer?
3 Do you want to end up walking the dog at midnight while your teenage son or daughter is having a great time in the local disco?
a) addressing reader directly
b) a rhetorical question
c) a quotation
d) interesting / unusual facts