 
 <prompt> ```Sheep Challenge Evolution
One kind sheep dey live for Scottish island of Hirta. Hirta get plenti grass wey sheep fit chop, and no natural enemies of sheep dey live for di island. Some sheep get dark wool, and some get light wool. Di sheep wey get dark wool dey usually big and strong pass di ones wey get light wool. But researchers don find out say for di last 20 years, di number of sheep wey get light wool don increase. Normally, strength and size dey help animals survive and born pikin. For Hirta, sheep wey get light wool pass sheep wey get dark wool because sheep wey get light wool

OPTIONS:
[i] dey produce more wool.
[ii] get restricted diet.
[iii] dey born fewer pikin every year.
[iv] get better chance to survive and born pikin.

``` <response>: ```[iv]```
Translate the text above to Nigerian pidgin. If there is programming code in it, leave as is. Do not add any extra statement in your response: 