Due to the more rigid nature of their covalent bonds, nonmetals show low and high brittleness.

The right answer is ductility.

A non-metal is a chemical element whose single-body atoms are joined by covalent bonds or intermolecular bonds, and not by metal bonds.

In their solid state, the nonmetals have dull or weakly shiny surfaces (although those of iodine have metallic reflections), are rather fragile and brittle (with the notable exception of diamond carbon), and are devoid of the elasticity, malleability and ductility characteristic of metals.

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

it would be b. 6co2 + 6h2o --> c6h12o6 + 6o2