What is a bactericide?

The term "bactericide" specifically refers to a substance that is capable of destroying bacteria, which makes answer B the most accurate choice. A bactericide functions by targeting and killing bacterial cells effectively.

Option C suggests that it only destroys microorganisms without necessarily impacting their spores; however, that distinction actually aligns more closely with the concept of a disinfectant, which may not kill bacterial spores. Thus, while a bactericide primarily aims at bacteria, the capacity to destroy all forms of bacteria, including their spores, delineates its full efficacy.

The other options outline concepts that relate to the growth or prevention of bacteria rather than their outright destruction. Therefore, understanding the primary role of a bactericide as one that eliminates bacteria underlines its classification and function in microbiological and medical contexts.