When approaching and entering the Welland Canal at St. Catherine, which of the following is correct regarding the entrance range rear sector light?

The correct answer is that the yellow sector indicates the preferred channel when approaching and entering the Welland Canal at St. Catherine. The yellow sector light serves as a crucial navigational aid for mariners, indicating which part of the canal is safe and advisable for vessel passage. This is significant for ensuring the safety of vessels navigating through the canal, especially considering varying depths and possible hazards.

In terms of the other sectors, red typically indicates a danger or non-preferred area, which is often used to signify the edges of the navigable channel or obstructions. The green sector is also used for navigation but usually indicates safe passage in specific areas rather than the preferred channel itself. White sectors are often associated with safe waterways; however, they may not specifically denote the preferred path in the context of the Welland Canal.