Read and choose the option with the correct verb for the blank and with the correct price that matches the word or words in bold type. Your friends are shopping for furniture today. This is what they are told at the store: La cómoda, el tocador y la alfombra cuatro mil quinientos dólares.

i think its cuestan but it could be cuesta

Explanation:

corras is the only one that is informal but doesn't follow the suffix rule. correr is the verb. corre is the formal verb form. corra would be used as the formal is corre ended with an a.

your best bet would be corras, it's the only one that is informal but is still wrong