6. Would be A. ¿Cuánto cuestan? Which is how much are they.
"Mexico do not provide lunch.) The officials quickly became snared in a web of special interests led by Mexico's powerful snack food companies, which found support from regulators in the Ministry of the Economy"
Depends on what you want to say, since "Tomar' has two meanings.
"Tomar", as in drinking and "tomar", as in taking.
I honestly don't think there's actually a formal way of saying tomar. It depends on the sentence & how you want to address the person.
Ex. Usted se puede tomar el agua? Can you drink the water?
Ahora, ustedes tomaran el examen > Now, you'll take the exam (but in a polite way!)
If you have any more doubts feel free to ask me!
