Use the following information to answer the question.
A plantlike organism on the planet Pandora can have three recessive genetic traits: bluish leaves, due to an allele (a) of geneA; a feathered stem, due to an allele (b) of gene B; and hollow roots due to an allele (c) of gene C. The three genes are linked and recombine.
A geneticist performed a testcross with an organism that had been found to be heterozygous for the three recessive traits, and she was able to identify progeny of the following phenotypic distribution (+ = wild type):
The greatest distance among the three genes is between a and c. What does this mean?
A) Gene c is between a and b.
B) Gene a is between b and c.
C) Genes are in the order: a-b-c.
D) Gene a is not recombining with c.