The correct answer is: $68\text{ °F}$
Explanation
To convert Celsius to Fahrenheit use the formula $F = \frac{9}{5}C + 32$. For $C = 20$ you substitute and compute.
Steps:
- Formula: $F = \frac{9}{5}C + 32$
- Substitute: $F = \frac{9}{5}\times20 + 32$
- Compute: $F = 36 + 32 = 68\text{ °F}$
Therefore, $20^\circ\text{C}$ equals $68\text{ °F}$.