A. Killing Alexander Hamilton in a duel.

B. Serving as Chief Justice of the Supreme Court for 34 years.
C. Negotiating treaties that gained new lands for the U.S.
D. Serving many terms in the House of Representatives.

I think its B. But I am not sure, am I correct?

The question was what was John Marshall remembered for?

http://www.google.com/?gws_rd=ssl#q=john+marshall

To determine whether B is the correct answer, we need to understand the accomplishments associated with each option and assess which one aligns with serving as Chief Justice of the Supreme Court for 34 years.

A. Killing Alexander Hamilton in a duel: This event refers to the famous duel between Aaron Burr and Alexander Hamilton, which resulted in Hamilton's death in 1804. Though historically significant, it is not an accomplishment that can be credited to someone.

B. Serving as Chief Justice of the Supreme Court for 34 years: This option refers to the tenure of John Marshall, who held the position of Chief Justice of the Supreme Court from 1801 to 1835. Marshall is known for shaping the Court into a powerful and independent branch of government and establishing many principles of constitutional law.

C. Negotiating treaties that gained new lands for the U.S.: This option pertains to the efforts of various diplomats and politicians in expanding the territorial boundaries of the United States through treaties, such as the Louisiana Purchase or the acquisitions from Mexico following the Mexican-American War.

D. Serving many terms in the House of Representatives: This option suggests someone who has held multiple terms as a representative in the House of Representatives, which is an accomplishment but not necessarily on par with serving as Chief Justice.

Based on the descriptions, option B aligns with serving as Chief Justice of the Supreme Court for 34 years. Therefore, your intuition is correct, and B is likely the correct answer.