Which characteristic is responsible for human skin color?

Human skin colour is an example of:
$I.$ Multiple gene inheritance
$II.$ Three separate genes controlling this trait
$III.$ Single gene controlling this trait
$IV.$ Two genes controlling this trait
$V.$ Environment plays a significant role in this trait
Choose the correct option.

In human beings,the colour of skin is controlled by

$A$ characteristic showing continuous variation is controlled by a

Human skin color is determined by polygenic inheritance. How many types of phenotypes will be produced by the cross $AaBbCc \times AaBbCc$?

Polygenic inheritance is observed in which of the following?