Which of the following is considered one of the four noble varieties of Alsace?

Gewurztraminer is recognized as one of the four noble varieties of Alsace due to its unique characteristics and ability to express the region's terroir. This aromatic grape variety is known for producing rich and complex wines with pronounced floral and spice notes, often accompanied by tropical fruit flavors. The climate and soil of Alsace contribute to the elevated quality of Gewurztraminer, making it a standout in the region.

The term "noble varieties" in Alsace typically refers to those grape varieties that achieve high levels of complexity and concentration, and Gewurztraminer is undoubtedly one of them. Its ability to produce high-quality wines that can age gracefully adds to its stature as a noble variety in Alsace.

The other varieties listed—Chardonnay, Cabernet Sauvignon, and Merlot—are significant in other wine regions but do not hold the same prestigious status within Alsace specifically, where the focus is on the unique expressions of the noble varieties cultivated there.