**Core Concept**
Streptococcus pneumoniae is a common cause of bacterial meningitis in children, and prompt initiation of antibiotic therapy is crucial to prevent complications and improve outcomes. The choice of antibiotic and duration of treatment are critical in managing this condition.

**Why the Correct Answer is Right**
The recommended treatment for bacterial meningitis caused by Streptococcus pneumoniae in children typically involves a 10-day course of antibiotic therapy with a combination of a third-generation cephalosporin (such as ceftriaxone) and vancomycin. This dual-antibiotic approach is aimed at covering for potential penicillin-resistant strains of S. pneumoniae. The 10-day duration ensures that the bacteria are fully eradicated from the cerebrospinal fluid (CSF) and prevents the development of antibiotic resistance.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because a 5-day course of antibiotic therapy is insufficient to effectively treat bacterial meningitis caused by S. pneumoniae in children, increasing the risk of complications and treatment failure.
* **Option B:** This option is incorrect because a 14-day course of antibiotic therapy is not necessary for treating bacterial meningitis caused by S. pneumoniae in children, and may increase the risk of antibiotic resistance.
* **Option C:** This option is incorrect because a 7-day course of antibiotic therapy may not be sufficient to fully eradicate the bacteria from the CSF, increasing the risk of treatment failure.

**Clinical Pearl / High-Yield Fact**
In children with bacterial meningitis, it is essential to initiate antibiotic therapy promptly, ideally within 30 minutes of diagnosis, to prevent complications and improve outcomes.

**Correct Answer: C. 10 days.**