Naturally-Produced Penicillins Are Most Effective Against Gram-Positive Bacteria Because ________

Naturally-produced penicillins are most effective against gram-positive bacteria because ________.

A) they prevent the synthesis of peptidoglycan which comprises the gram-positive cell wall
B) they target the enzymes needed by gram-positive cells for ATP production
C) they inhibit the permeability of the gram-positive cell membrane
D) they target the 30s subunit of the gram-positive ribosome