Question 4960 Deck General

The correct answer is D) December. The St. Lawrence Seaway, which connects the Great Lakes to the Atlantic Ocean, typically experiences significant ice buildup by mid-December, halting navigation through the waterway. This is due to the colder winter temperatures in the region during this time of year. The other answer choices are incorrect because ice formation is generally not strong enough to halt navigation by mid-November (A), January (B), or October (C).