Pneumococci (Streptococcus pneumoniae) are the most common cause of bacterial meningitis, especially in children. They frequently lead to recurrent meningitis when there is a cerebrospinal fluid (CSF) leak, as the leak allows bacteria to enter the subarachnoid space. This is particularly seen in cases of cranial base fractures or post-surgical CSF leaks. While meningococci and H. influenzae also cause meningitis, pneumococci are most strongly linked to recurrent episodes in the setting of CSF leaks. E. coli is more common in neonates or as a result of other infections, not typically associated with recurrent meningitis from CSF leaks.

**✓ Correct: B. Pneumococci**