Recessive and sex-linked since it does not show up in the parents (recessive) and almost only in males (sex-linked). Females almost never show it since they would have to inherit two defective alleles, much less likely than males inheriting one.
Work Step by Step
To get this answer, scan through the chapter and list the major features of the various phenomena described. Then see what matches up with the case listed (males, not seen in parents) and predict the result in females from what the chapter says about the chosen phenomenon. The familial patterning of a heritable trait will be specific, in this case, to the genotype and allow for prediction.