Please answer the following question. I selected option B and got it wrong. I am not sure what the correct answer is.

Provide an appropriate response. The federal guideline for smog is 12% pollutants per 10,000 volume of air. A metropolitan city is trying to bring its smog level into federal guidelines. The city comes up with a new policy where city employees are to use city transportation to and from work. A local environmental group does not think the city is doing enough and no real decrease will occur. Identify the Type I error in this context. The city sampled only a dozen units of air. The city stops the new policy, but in fact the smog level is declining and the policy helps. The city concludes that smog is on the decline, but in fact the new policy does not help smog levels. The city concludes that smog is on the decline since the smog level can only decrease. The product of the city's sample size and sample proportion was less than 10