From the examples below, identify the correct form of citation:
a)according to mcmahon (1988), math ability is acquired.
b)individual differences in memory have been found (gelfand, 1987).
c)in 1988, scarano found that androgynous women respond to self-worth dilemmas differently than dostereotypic women.
d)lavin (1986) observed that tv serves as a surrogate parent for some young adults. lavin found that "soapaddicts" have limited parental contact.
e)all of the above are correct.