Ella fue a la playa tenia mucho trabajo tengo muchos libros
Soy (yo form, present tense) - use when describing traits about yourself (permanent traits, not thoughts/feelings/locations/etc)
Era (yo/el/ella/usted form, past tense) - directly translates to 'was.' use when describing something in the past
It is in the north of spain
A means juan and ana, do you sit here
B means juan and ana, let's sit here
C means juan and ana, sit here
D means juan and ana, let's sit here
And I believe it is C