 
 <prompt> ```
One balloon wey dem fill with helium gas don dey fly up. Which one of these explanations dey best explain why the helium balloon dey move up?
Available choices: a. The density of helium dey less pass the density of air. b. The air resistance dey lift the balloon up. c. There no dey gravity wey dey act on top the helium balloons. d. The wind dey blow the balloon up. The answer na:``` <response>: ```a.```
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: 