In a certain country with 14 million inhabitants, $0.15 \%$ of the population caught a certain flu. How many inhabitants did not catch this flu?
(a) 13979000
(b) 1397900
(c) 139790
(d) 13979
(e) 139790000
The correct option is (a).

15% of 14000000 contracted the flu, that is,

$$
\frac{0.15}{100} \times 140000000=0.0015 \times 14000000=21000
$$

people. Therefore, the number of people who did not contract the flu is $14000000-21000=13979000$ people.