Choose the correct meaning of yo preparo la sopa para margarita. i'm preparing the soup for margarita. (instead of her) i'm preparing the soup for margarita. (she's the recipient.)

I'm preparing the soup for Margarita. (She's the recipient.).

Explanation: When we say " Yo preparo la sopa para Margarita." we can translate this to "I am preparing the soup for Margarita", which means that we are making soup and we want to give it to Margarita.

Then, the right option is I'm preparing the soup for Margarita. (She's the recipient.), because this means that Margarita will receive the soup.

The other option, "I'm preparing the soup for Margarita. (instead of her)" can be written as:

"Estoy preparando la sopa por Margarita"  

or

"Estoy preparando la sopa en el lugar de Margarita"

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