The answer for this problem would be C) los
Cual es la forma ? no la podemos ver lol ( whats the form ? we cant see it lol )
Ser: more permanent situation
D: description
O: occupation
C: characteristic
T: time/date
O: origin (where a person or thing comes from)
R: relationships
estar: more temporary situation
P: preposition
L: location
A: action
C: condition
E: emotion
practice with ser/estar rlly is the best way to master it :)