I can help but you need tell me what conjugation you need to know like "yo pienso" is present "yo pense" is preterite "yo pensaba" is imperfect "yo pensaria" is conditional and last is "yo pensare" is future those are you option
B. lo.
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Since it ends "O" I am pretty sure the definite article would be "El"
The answer is primo (cousin)
Sorry the answer is late. Hope I helped
