Choice "A" is correct. Under the Negotiable Instruments Article with respect to a holder who is not a holder in due course and who is not covered by the shelter doctrine, a maker or drawer may raise any contract defense, but the defenses that a maker or drawer can raise against a holder in due course (a holder who takes an instrument for value, in good faith, and without notice of any defenses on or claims to the instrument, and the instrument is a negotiable instrument/commercial paper) and against a holder to whom the shelter doctrine applies are limited to those commonly known as "real" defenses. One such real defense is the minority of the maker (we use the term "infancy" in class, but the two terms mean the same thing).
Choices "b", "d", and "c" are incorrect because they are not so-called real defenses and, as such, cannot be raised against a holder in due course.