Which survey question is unbiased?

1. "do you think we should allow them to cut down the trees and pave over the grass for a new playground? "

2."which do you prefer with a meal-water, or a syrupy sweet soft drink? "

3."should there be a school dress code? "

4."do you prefer bringing a healthy lunch to school or eating cafeteria food? "

plzz !

(c) the diagram shows the first three shapes of a matchsticks arrangement.first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.