Which of the following is a trait of public goods

The correct answer would be, The most important trait of public goods is that they are non exclude-able and nonrivalrous.  

Explanation:

Public goods are the goods that are provided by the government of a country for the general public of that country and each and every person of the country can use those goods. The most common examples of public goods are rides in parks, benches, shades of trees, public washrooms, public recreational parks, etc.

The public goods are non exclude-able and nonrivalrous because no one can be excluded from using these goods and the use of these goods by one cannot reduce the availability of it for the others.

well considering i can't see the graph, it's probably prices

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.