Passage of information from parents to offspring — practice question

In the fruit fly, Drosophila melanogaster, there are autosomal genes controlling body colour and wing shape. Gene $B/b$ is responsible for body colour production: $B$ is the dominant allele for brown body colour, while $b$ is the recessive allele for black body colour. Gene $D/d$ is responsible for wing shape: $D$ is the dominant allele for straight wing, while $d$ is the recessive allele for curved wing. A dihybrid test cross was performed between flies heterozygous for body colour and wing shape and flies homozygous recessive for body colour and wing shape.