The correct option is
B Myrosin, enzyme
In the members of family Cruciferae, secretory cells are found, which contain myrosin enzyme. The characteristic smell of these plant is due to the presence of sulphur containing glucosides, which hydrolyzes them into glucosides, which hydrolyzes them into glucose and isothiocyanates.
Latex is characteristic feature of family Papaveraceae, e.g, poppy
Pectin is mucopolysaccharides that occur in plant cell walls.
Alkaloids are nitrogenous substances, e.g., quinine from bark of Cinchona, reserpine from roots of Rauwolfia serpentina, atropine from Atropa belladona.
So, the correct answer is option B.