To solve this problem, we need to understand the difference between narrow spectrum and broad spectrum antibiotics.$\newline$Narrow spectrum antibiotics are effective against a specific group of bacteria, while broad spectrum antibiotics$\newline$are effective against a wide range of bacteria.$\newline$Let's analyze the given options:$\newline$• Option 1: Penicillin G$\newline$ - Penicillin G is a narrow spectrum antibiotic. It is primarily effective against Gram-positive bacteria.$\newline$• Option 2: Ampicillin$\newline$ - Ampicillin is a broad spectrum antibiotic. It is effective against both Gram-positive and some Gram-negative bacteria.$\newline$• Option 3: Amoxycillin$\newline$ - Amoxycillin is also a broad spectrum antibiotic, similar to Ampicillin, effective against a wide range of bacteria.$\newline$• Option 4: Chloramphenicol$\newline$ - Chloramphenicol is a broad spectrum antibiotic, effective against a wide variety of bacteria.$\newline$Therefore, among the given options, Penicillin G is the narrow spectrum antibiotic.$\newline$This corresponds to Option 1.