Explanation
The correct answer is option 2 (use engine braking by engaging the same gear used on the ascent). This question assesses defensive driving; this alternative directly meets the conditions in the prompt and the road-safety rules. The other alternatives broaden, narrow, or depart from the stated conditions and therefore should not be selected. Under the current rule, the difficulty is 4 on a scale from 1 to 5.
Source
Reference not provided yet.