The correct answer is option 4 - all three effects, constriction of blood vessels, digestive spasms, and impairment of night vision, are the effects of long-term exposure to noise pollution on normal human beings.

Constriction of blood vessels refers to the narrowing of the blood vessels, which can lead to increased blood pressure and reduced blood flow to various organs. This effect is associated with long-term exposure to noise pollution.

Digestive spasms are involuntary contractions of the muscles in the digestive system. Prolonged exposure to noise pollution can disrupt the normal functioning of the digestive system, leading to spasms and digestive issues.

Impairment of night vision refers to a reduced ability to see clearly in low light conditions, particularly at night. Research has shown that prolonged exposure to noise pollution can have a negative impact on the visual system, including the ability to see in the dark.

Therefore, all three effects mentioned in the options - constriction of blood vessels, digestive spasms, and impairment of night vision - are potential consequences of long-term exposure to noise pollution in normal human beings.