In plants, Sulfur plays a significant role in:

Sulfur is an essential macronutrient for plants and plays a crucial role primarily in protein synthesis and the formation of flavor compounds. It is a key component of amino acids such as cysteine and methionine, which are the building blocks of proteins. Through protein synthesis, plants use sulfur to create various enzymes and structural proteins necessary for growth and development.

Additionally, sulfur is involved in the synthesis of flavor compounds known as secondary metabolites. These compounds contribute to the taste and aroma of many plants, particularly edible ones like garlic, onions, and certain herbs. By influencing flavor aspects, sulfur impacts not only plant health but also the appeal and quality of crops for consumption.

While sulfur does have other roles in plant physiology, such as involvement in photosynthesis and enzyme function, its most prominent contributions are indeed related to protein synthesis and flavor compound development, making this the correct choice.