For this case we have the following expression used for comparison:
"Tanta como"
This expression is used to compare things that are the same.
For example, we have the following comparison:
La camioneta tiene tanta velocidad como el carro.
We observe that both the truck and the car have the same thing in common, speed.
Answer:
You can use the phrase tanta como for:
C. To compare things that are equal