The correct answer is: Catholics, Jews and Muslims.
The coexistence of the three religions took place for centuries in the Spanish territories and this contributed to generate an extremely rich cultural exchange.
The creation of the Toledo School of Translators evidenced so. It was an institution created by the monarch Alfonso X the Wise. It was operating during the 12th and 13th centuries when scientific and literary text were translated from classic Arabic and Hebrew to Latin and Castilian (incipient language which is the origin of the Spanish language), and from Latin to those languages.
Finally, both Muslims and Jews were expelled, the first ones as a result of the Reconquista process and the latter ones were explicitly sent out by the so-called Catholic Monarchs.