Ben Signs a Promissory Note for $1,500 in Favor of Community

Ben signs a promissory note for $1,500 in favor of Community College. The note is undated but specifies that it is "payable one month after date." This note is

A) ​negotiable.
B) ​not negotiable, because one month is not a reasonable time.
C) ​not negotiable, because there is no option to pay early.
D) ​not negotiable, because the maturity date cannot be determined from the face of the instrument.