Which of these is not a modern-day continent? a. india b. australia c. antarctica d. south america

Hi

The answer is India.
India is a country inside the continent, Asia.

Hope this helps! :)

Sequoia national park  /  inyo national forest, california, u.s. mount whitney is the tallest mountain in california, as well as the highest summit in the contiguous united states and thesierra nevada—with an elevation of 14,505 feet (4,421 m).