【单选题】
A <{p}>1. Tax-deductible contributions.<{/p}><{p}>1. 免税捐助。<{br/}><{/p}>
B <{p}>2. Limits on contributions.<{/p}><{p}>2. 捐款限制。<{br/}><{/p}>
C <{p}>3. Mandatory participation.<{br/}>3.强制参与。<{br/}><{/p}>
D <{p}>4. Tax-deferred earnings.<{br/}><{/p}><{p}>4. 递延税收入。<{br/}><{/p}>
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