In the cross between two individuals heterozygous for two different traits, it is expected that a 9:3:3:1 ratio of phenotypes

Question

In the cross between two individuals heterozygous for two different traits, it is expected that a 9:3:3:1 ratio of phenotypes will occur in the offspring. Yet, a ratio of 6:6:2:2 might indicate 
(A) pleiotropy.
(B) genomic imprinting.
(C) incomplete dominance.
(D) X-linkage.
(E) gene linkage.

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