EE: mandatos ud y uds
look at the screenshots below

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

the correct answers are:

[b]:   " fray bentos " .

[c]:   " paysandú   " .

[d]:   " colonia del sacramento   " .

[e]: " salto " .

[g]:   " nueva palmira " .

hope this !

  best wishes.