A.I. Explanation:

Option 1: "The objective behind analyzing rainwater was to determine which state has got the most polluted water."

Explanation: This option is incorrect because the text states that the purpose of analyzing rainwater was to analyze the pollutants contained in the samples, not to determine which state has the most polluted water. The focus is on pollution analysis rather than state comparison.

Option 2: "Chris Lehmann considered the study program as a good short-term strategy."

Explanation: This option is incorrect as the text indicates that Chris Lehmann described the study program as one of the longest-term studies, implying it is a long-term strategy rather than a short-term one.

Option 3: "Lehmann believed that rainfall chemistry and air pollution were correlated."

Explanation: This option is correct because the text explicitly states that Chris Lehmann explained that rainfall chemistry does have a direct correlation with air pollution, confirming his belief in their relationship.

Option 4: "The National Environmental Deposition Program collected rain samples collected from over 250 stations across USA."

Explanation: This option is incorrect due to a misnomer; the correct name is 'The National Atmospheric Deposition Program,' not 'The National Environmental Deposition Program.' Additionally, the text does not specify that the samples were collected from 'across USA' but rather from 'over 250 stations across the States,' which is less specific.

Option 5: "The report released after carrying out the study included details of the frequency of acid rain."

Explanation: This option is correct as the text states that a full report was released which encapsulates details of the frequency of acid rain and the concentration over a period of 25 years, directly supporting this statement.