**Core Concept**
Bacillus anthracis, the causative agent of anthrax, is a gram-positive, rod-shaped bacterium that produces spores as a survival mechanism. The spores of B. anthracis are characterized by their unique morphology, which is essential for identification.

**Why the Correct Answer is Right**
B. anthracis spores are subterminal, meaning they are located near the end of the bacterial cell but not right at the terminal end. This characteristic is a key feature for distinguishing B. anthracis from other Bacillus species. The subterminal spores are typically 1-2 µm in length and are usually found in a polar location.

**Why Each Wrong Option is Incorrect**
**Option A:** While other Bacillus species may produce spores, they do not have the characteristic subterminal spore arrangement of B. anthracis.
**Option B:** Clostridium species, such as C. tetani, produce terminal spores, not subterminal spores.
**Option C:** Staphylococcus species, including S. aureus, do not produce spores at all.

**Clinical Pearl / High-Yield Fact**
The ability of B. anthracis to form subterminal spores is a key factor in its survival and transmission. This characteristic is also essential for its identification in clinical and laboratory settings.

**Correct Answer: C. Staphylococcus species, including S. aureus, do not produce spores at all.**