After the death of president harrison, became president

After the death of President Harrison, John Tyler became president.William Henry Harrison was born on 9th of February in the year 1773 and died on 4th of April in the year 1841. He was the ninth President of the United States of America. He died on the 32nd day after he took the office of the President of United States. He became the president at the age of 68. He died of the disease of pneumonia. he became the president after Ronald Regan.

Ithink the answer is d but don’t answer it. i need points.

Thomas edison created the light bulb.