To convert Celsius to Fahrenheit, you can use the formula:
\[ F = \frac{9}{5}C + 32 \]
First, let's convert the lower limit (20°C):
\[ F = \frac{9}{5} \times 20 + 32 = 36 + 32 = 68°F \]
Now, let's convert the upper limit (35°C):
\[ F = \frac{9}{5} \times 35 + 32 = 63 + 32 = 95°F \]
Thus, the temperature range in Fahrenheit is from 68°F to 95°F.
The correct answer is:
68°F to 95°F