Many people have made a ______ to a physical fitness program so

Many people have made a ______ to a physical fitness program so as to maintain good health.
A、decision
B、commitment
C、contribution
D、difference
【正确答案】：B
【题目解析】：本句是带有不定式短语作目的状语的简单句。句意为“许多人都投入了身体锻炼计划，以保持良好的健康”。make a commitment“投入，保证”符合题意。