Melanoma Is Cancer of the Skin That Originates with Uncontrolled

Melanoma is cancer of the skin that originates with uncontrolled division of a melanocyte (pigment cell) . Although genetic tests are available to screen for melanoma, they are not appropriate for all individuals. However, an individual's risk can be assessed by analyzing his or her family history. An individual's risk of developing melanoma increases if one or more first-degree relative (mother, father, brother, sister, child) has had melanoma. Which of the following are possible explanations for this increased risk?

A) inheritance of any gene mutation that predisposes the individual to developing any type of cancer
B) inheritance of specific gene mutations that predisposes the individual to developing melanoma
C) similarity in lifestyles among individuals of the same family line (e.g., use of tanning beds or time outside in the sun)
D) the high likelihood of multiple family members who develop identical somatic cell mutations later in life