**Core Concept**
The question is testing knowledge about **Streptococcus**, a genus of **Gram-positive**, **spherical** bacteria. Streptococci are commonly implicated in various human infections, and their classification is crucial for clinical management.

**Why the Correct Answer is Right**
Since the correct answer is not specified, let's consider a general aspect of Streptococcus. For instance, if the correct answer pertained to the bacteria being **facultative anaerobes**, this would be correct because many streptococcal species can grow in both aerobic and anaerobic environments.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific details of option A, it's challenging to provide a precise explanation. However, if it stated that Streptococcus is a Gram-negative bacterium, this would be incorrect because Streptococci are **Gram-positive**.
**Option B:** Similarly, without specifics, if option B suggested that all Streptococci are strictly anaerobic, this would be wrong as many are **facultative anaerobes**.
**Option C:** If option C proposed that Streptococci are typically **spore-forming**, this would be incorrect since they do not form spores.
**Option D:** If option D claimed that Streptococci are always **motile**, this would be incorrect as they are generally non-motile.

**Clinical Pearl / High-Yield Fact**
A key point to remember is the classification of Streptococci, particularly the distinction between **alpha-hemolytic** (e.g., Streptococcus pneumoniae) and **beta-hemolytic** (e.g., Streptococcus pyogenes) species, which is crucial for diagnosing and treating infections.

**Correct Answer:**