Which survey question is unbiased?

"Do you think we should allow them to cut down trees and pave over the grass for the new playground?"
"which do you prefer with a meal----water, or a syrup sweet soft drink?"
"should there be a school dress code?"
"Do you prefer bringing a healthy lunch to school or eating cafeteria food?"

Question

Which survey question is unbiased?

"Do you think we should allow them to cut down trees and pave over the grass for the new playground?"
"which do you prefer with a meal----water, or a syrup sweet soft drink?"
"should there be a school dress code?"
"Do you prefer bringing a healthy lunch to school or eating cafeteria food?"

fluttershyk · Answer

@rebeccaxhawaii  @563blackghost @booknerd1234

rebeccaxhawaii · Answer

i think its C not sure all the other questions have limited options

fluttershyk · Answer

@rebeccaxhawaii I thought C as well

563blackghost · Answer

:P im late....I think C as well..sorry i was helping someone