Glaciers have shaped many of Earth's landscapes ______ they carved out fjords, valleys, and even the Great Lakes over thousands of years.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A
(empty)
- B
, which is how
- Ccheck_circle
;
- D
,
Explanation
A semicolon joins two related independent clauses cleanly. ", " is a splice; " " is a run-on; ", which is how" creates an awkward and ungrammatical structure.