A Plantlike Organism on the Planet Pandora Can Have Three

Multiple Choice

A plantlike organism on the planet Pandora can have three recessive genetic traits: bluish leaves,due to an allele (a) of gene A;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 did a testcross with an organism that had been found to be heterozygous for the three recessive traits and was able to identify progeny of the phenotypic distribution (+ = wild type) shown in the figure below.
In which progeny phenotypes has there been recombination between genes A and B? The parent phenotypes are 4 and 8.

A) 1,2,5,and 6
B) 1,3,6,and 7
C) 2,4,5,and 8
D) 2,3,5,and 7