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
Answer:
2. ¿Qué hay en el escritorio? (Three pens, seven books, a stapler, and some papers)
Explanation: