Last night, my cousin and I ____ Shakira's new song for the first time.
Because the subject is "my cousin and I", and because the sentence is relating to a past event, this sentence requires the first-person plural preterite conjugation.
'oyeron' is "They listened". '<span>oí' is "I listened". '</span><span>oyó' is "He/she/it listened".
The correct conjugation is </span><span>A. oímos, or 'We listened'. </span>