 
 <prompt> ```Index fossils dey help scientists estimate di age of rock because index fossil species only exist for short time. Wetin happun to di species wey dem dey use as index fossils now?
OPT: I. Dem become extinct. II. Dem change dia diets. III. Dem hide for marine sediments. IV. Dem migrate go new environments.``` <response>: ```I.```
Translate di text above go Nigerian pidgin. If there dey programming code inside, leave am as e be. Don't add any extra statement for your response: 