Choose the correct Preterite conjugation.
Mi madre
(cocinar) la cena anoche.

The correct conjugation in Preterite Tense of the verb between parentheses is:

Preterite Tense in Spanish.

The conjugation of the verb "cocinar" in preterite tense, taking into account the personal pronouns is:

Since the sentence uses as a noun "mi madre," which can be replaced by the personal pronoun "ella," the appropriate conjugation based on the guide above is "cocinó."

More information:

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Cocinó.

Explanation:

Mi madre  cocinó la cena anoche.