The journey of Lewis and Clark,
which was commissioned by Thomas Jefferson, began in 1804 on the Missouri River, after months of preparation, and had been completed over two years later, when the expedition members entered the Mississippi River and disembarked back in St. Louis.
A. which was commissioned by Thomas Jefferson, began in 1804 on the Missouri River, after months of preparation,
and had been Event happened later (had been is incorrect)
B. commissioned by Thomas Jefferson, had begun in 1804 on the Missouri River, after months of preparation, and being
usage of being is incorrect C. which
was commissioned by Thomas Jefferson, began in 1804 on the Missouri River, after months of preparation, and
was Correct usage of verb and maintains parallelism
D. commissioned by Thomas Jefferson, begun in 1804 on the Missouri River, after months of preparation it
had been Incorrect verb form
E. commissioned by Thomas Jefferson, which was begun in 1804 on the Missouri River, after months of preparation, and
had been Incorrect verb form