Based on APA Style,what Is Wrong with the Following Reference

Multiple Choice

Based on APA style,what is wrong with the following reference? Karau,S.J.,& Williams,K.D. (1993) .Social Loafing: A Meta-analytic Review and Theoretical Integration.Journal of Personality and Social Psychology,65,681-706.

A) The name of the journal should be underlined.
B) The reference should not be double-spaced.
C) Only the first letter of the first word and the first letter of the first word following the colon in the title of the paper should be capitalized.
D) Nothing is wrong with the reference.