What improvement made to penicillin during World War II saved many soldiers' lives?

Different types of penicillin were developed.

Stronger types of penicillin were developed.

Larger quantities of penicillin were made.

Smaller quantities of penicillin were made.

The answer is the third one - larger quantities of penicillin were made. The devastation of the war had lead the government to force companies to mass produce penicillin in order to treat infections and wounds which are common in wars. For this reason, a huge quantity of penicillin was produced to aid soldiers in the war.