The correct option is A Found on separate chromosomes
According to Mendel's law of independent assortment, during the inheritance of two or more characters, the assortment of individual traits takes place independently during gamete formation. Thus each allele of a pair segregates independently and each gamete formed contains one allele of that trait. As per this law, the 'factors' which were later called as genes were explained to assort independently. But there are chances of these genes undergoing linkage. Thus, it is said that the law is applicable only for those genes which do not undergo linkage hence they are located on different chromosomes. Thus, the correct answer is option A.