Question

Which sentence is the correctly written compound sentence?

A.
The Grand Canyon in Arizona is 277 miles long.

B.
The Grand Canyon was carved by the Colorado River in the state of Arizona, the steep-sided canyon is 277 miles long.

C.
In the state of Arizona, the Colorado River carved the Grand Canyon, and it is 277 miles long.

D.
The Grand Canyon was carved by the Colorado River in the state of Arizona; the steep-sided canyon is 277 miles long.

Answer 1

D. The Grand Canyon was carved by the Colorado River in the state of Arizona; the steep-sided canyon is 277 miles long.

Step-by-step explanation:

Answer for Plato.

Answer 2

D. The Grand Canyon was carved by the Colorado River in the state of Arizona; the steep-sided canyon is 277 miles long.

Because it uses a semicolon properly - it consists of two sentences which can stand independently, but the full stop is replaced by the semicolon so now they are together :D