A) Brassicaceae - Tetramerous flowers, six stamens, bicarpellary gynoecium, siliqua type fruit
B) Brassicaceae - Pentramerous flowers, many stamens, pentacarpellary gynoecium, capsule type fruit
C) Solanaceae – Pentamerous flowers, five stamens, bicarpellary gynoecium berry type fruit
D) Poaceae – Trimerous flowers, three stamens, monocarpellary gynoecium, caryopsis type of fruit
Explanation
Mustard (Brassica campestris) belongs to family-Brassicaceae (Cruciferae). Mustard is characterised by tetramerous flower, six stamens with tetradynamous condition (i.e., two stamens of outer whorl are smaller than the four stamens of inner whorl), bicarpellary gynoecium and siliqua type of fruit.