The answer is A, seras since you needed to conjugate it for the noun tu
Los españoles peninsulares que llegaron a Sudamérica para conquistarla se llamaban conquistadores.

They are called "<u>conquistadores</u>" because they conquer a territory that is not theirs. In addition to:
- Conquistador ⇝ <u>Conquistar</u>
<h3><em><u>MissSpanish</u></em></h3>
Estar
Used for position, location, action, condition and emotion.