Answer:
lo
Explanation:
it came down to either "lo" or "la", lo is masculine and la is feminine. So the answer was lo because if there is no signs that the sentence is feminine then you just use the masculine word/s.
B
I believe the answe is b think about it it makes more sense
Tú: respiras
ellos/ ellas: respiran
tu in past tense:respiraste
ellos/ellas in past tense: respiraron
Algunas lecciones = some lessons