ANS:B - -40°

The Fahrenheit and Celsius scales have the same numerical value at -40°. This is because the Fahrenheit scale was defined such that 32°F is the freezing point of water and 212°F is the boiling point of water under standard atmospheric pressure, while the Celsius scale sets 0°C as the freezing point and 100°C as the boiling point under the same conditions. The conversion formula between Fahrenheit (F) and Celsius (C) is: F=9/5​C+32 So, when Celsius (C) is -40, F=9/5​(−40)+32=−40 Thus, -40°F is equal to -40°C. Therefore, -40° is the temperature where both Fahrenheit and Celsius scales have the same reading.