Choose the correct sentence. choose one answer.
a. ​alaska, the largest but least populous​ state, was once called​ "seward's folly," after secretary of state who arranged its purchase from russia in 1867.
b. ​alaska, a largest but least populous​ state, was once called​ "seward's folly," after the secretary of state who arranged its purchase from russia in 1867.
c. ​alaska, the largest but least populous​ state, was once called​ "seward's folly," after the secretary of state who arranged its purchase from the russia in 1867.
d. ​alaska, the largest but least populous​ state, was once called​ "seward's folly," after the secretary of state who arranged its purchase from russia in 1867.