Answer:
A) a percentage
Step-by-step explanation:
Since the firm wants to show the proportion of the people who support the new park out of the total number of people who completed the survey, they must use a percentage or a fraction.
Usually percentages are used because a more standard answer can be given: for example, 230 positive answers out of 435 total answers can be represented as 230/435 = 46/87, or we could use 53%.