Task: Question Answering
Input (English): Background Paragraph: A large log placed in a fire will burn relatively slowly. If the same mass of wood were added to the fire in the form of small twigs, they would burn much more quickly. This is because the twigs provide a greater surface area than the log does. An increase in the surface area of a reactant increases the rate of a reaction. Surface area is larger when a given amount of a solid is present as smaller particles. A powdered reactant has a greater surface area than the same reactant as a solid chunk. In order to increase the surface area of a substance, it may be ground into smaller particles or dissolved into a liquid. In solution, the dissolved particles are separated from each other and will react more quickly with other reactants. 
Story: Demetrious is conducting chemical reactions for his community college chemistry laboratory course. In his first reaction, reaction A, he uses sodium oxide as the reactant in the form of small particles. In his second reaction, reaction B, he uses sodium oxide as the reactant in the form of large chunks of material. Both reactions use the same total weight of sodium oxide. 
Question: Which reaction, reaction A or reaction B, will occur at a slower rate?
Output (English): reaction B.