Corporate Bonds Are Less Marketable Than Money Market Instruments and Corporate

Corporate bonds are less marketable than money market instruments and corporate equities because:

A) corporate bonds are not tax exempt and money market securities are.
B) the former are for smaller denominations.
C) corporate bonds are in fact not less marketable than money market instruments and corporate equities.
D) corporate bonds are long-term securities,which tend to be riskier and less marketable.