Answer:
Spanish verbs that end in -CAR must change the c to a qu before adding the ending of "yo" form in the preterite tense.
Examples:
Buscar goes to "yo busqué"
Tocar goes to "yo toqué"
Sacar goes to "yo saqué"
Pecar goes to "yo pequé"
Secar goes to "yo sequé"
Spymore