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The most appropriate antibiotic for treating beta-streptococcal pneumonia is penicillin. This antibiotic is particularly effective against beta-hemolytic streptococci, which are a common cause of pneumonia in certain species. Beta-streptococci are known to be sensitive to penicillin due to its mechanism of action that disrupts bacterial cell wall synthesis, leading to cell lysis and death.

When selecting an antibiotic, it's crucial to consider both the sensitivity of the specific strain of bacteria and the drug's pharmacokinetics. Penicillin has excellent tissue penetration and is usually the first-line choice for treating infections caused by beta-hemolytic streptococci, making it the most suitable option for this type of pneumonia.

Other antibiotics listed may not have the same level of efficacy against beta-streptococci or may have broader indications, but penicillin stands out clearly as the standard treatment for this particular infection, reinforcing its appropriateness in this context.