The answer is highlighted in red. Could someone show me why this is the answer?

Question

The answer is highlighted in red. Could someone show me why this is the answer? I'm confused

1) Wild type blue-eyed mary has blue flowers. Two genes control the pathway that makes the blue pigment: The product of gene W turns a white precursor into magenta pigment. The product of gene M turns the magenta pigment into blue pigment. Each gene has a recessive loss-of-function allele: w and m, respectively. A double heterozygote (Ww Mm) is self-pollinated. What proportion of offspring will be magenta? A. 1/16 B. 3/16 C. 1/4 D. 7/16 E. 9/16

Explanation / Answer

When the double heterozygote is self pollinated then the resultant offspring would in the ratio of 9:3:3:1. Basing on this the offspring in magenta would be 3 out of 16 (3/16). The blue flowers will be 9 (homozygous dominant) 3 (magenta - Heterozygous dominant) 3 mixed (heterozygous recessive) 1 white (homozygous recessive).

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