Correct Answer - D
Sclereids are highly thickened dead sclerenchyma cells with very narror cavities. Sclereids may be isodiameteric proly hedral,spherical,oval, short or cylinderical.sclereids may occur signly or in groups. They provide stiffness to the parts in which they occur.Sclereids are present the frit of guava,sapota apple and pear, epidermal covering of legume seeds, petiole of lotus, ruit walls of nuts etc.