Correct answer:
inteligente
An adjective is a word that gives us more information about a noun or pronoun. Adjectives must agree with the noun or pronoun they describe in both number and gender. However, inteligente is an adjective that you can use with a masculine or feminine singular noun. The other adjectives inteligentes is masculine plural, cómicos is masculine plural and cómica is feminine singular. Finally:
Mi padre es inteligente