Question $20(4$ points$)$

A classic study by Brownell et al$.(1980)$ assessed the overall effectiveness of point$-$of$-$choice prompts for the promotion of stair climbing. They found that:

point$-$of$-$choice prompts were able to increase stair use to $5\%.$

there was minimal effect of point$-$of choice prompts on stair versus elevator use.

stair use increased by $16\%$ after the point$-$of$-$choice prompt.

point$-$of$-$choice prompts increased stair use by $30\%.$