The effect of the stress riser is much more pronounced in a brittle material than a ductile material. Which of the following is not the correct explanation for this behavior?

• A. Strain hardening occurs in ductile material, which increases the required stress for the flow of crack
• B. Strain hardening does not occur in a brittle material, so it results in sudden propagation of the crack
• C. Redistribution of stress does not occur in a brittle material
• D. The toughness of brittle material is much more than ductile material