To find the speed of the beetle, you can use the formula for speed which is:
[tex]\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \][/tex]
In this case, the beetle crawls a distance of 20 centimeters in 2 seconds. You can plug these values into the formula as follows:
[tex]\[ \text{Speed} = \frac{20 \text{ cm}}{2 \text{ s}} \][/tex]
Dividing the distance by the time gives:
[tex]\[ \text{Speed} = 10 \text{ cm/s} \][/tex]
So, the correct answer is 10 cm/s. The beetle is crawling at a speed of 10 centimeters per second.