Final answer:
The presence of dew suggests that the air temperature was low before sunrise, matching option (b). Dew forms when the temperature falls to or below the dew point, causing condensation of water vapor into droplets. b is correct
Step-by-step explanation:
Inference from the statement "The dew on the spider's web formed before sunrise" indicates that the air temperature was low before sunrise. This is because dew forms when the air temperature drops to or below the dew point, which is the temperature at which the air can no longer hold all of the water vapor it contained at higher temperatures, leading to water condensing into droplets.
The correct answer is b) The air temperature was low before sunrise. Moreover, the presence of dew on surfaces like a spider's web or a banana leaf also hints that the still air cooled by radiating at night usually does not fall below the dew point because when it does reach the dew point, condensation occurs and the latent heat released during this process prevents the temperature from dropping further. b is correct