Final answer:
The adjective ending for the sentence 'Die Tasche ist rot' is no ending.
Step-by-step explanation:
The correct adjective ending for the sentence 'Die Tasche ist rot' is no ending. In German, adjectives agree with the gender, number, and case of the noun they modify. In this case, 'rot' does not change because 'Tasche' is a feminine singular noun in the nominative case. If the noun were plural, masculine, or neuter, then the adjective ending would change accordingly.
Learn more about Adjective endings in German