The correct option is (c) 1 and 3 only.
Explanation
The Amazon Basin is located in the equatorial region and experiences a hot and wet climate throughout the year. This climatic zone supports Tropical Evergreen Forests.Statement 1 is Correct: The Amazon Basin receives direct insolation from the sun. Consequently, the day temperatures are consistently high throughout the year.
Statement 2 is Incorrect: While the annual range of temperature is small in equatorial regions, the diurnal (daily) range is significant. Standard geographical descriptions explicitly state that while day temperatures are high, at night the temperature goes down. Therefore, characterizing night temperatures as "high" in the same context as day temperatures is factually incorrect; the nights are comparatively cooler.
Statement 3 is Correct: Due to the presence of dense vegetation, heavy rainfall, and high rates of evaporation, the moisture content in the atmosphere remains elevated at all times. The humidity is high during both the day and the night, often making the weather feel sticky.
Key Takeaway: The Equatorial climate of the Amazon Basin is defined by high heat and humidity during the day, but while humidity persists at night, the temperature drops significantly.