**Explanation:**

Solid catalysts are widely used in various industrial processes for accelerating chemical reactions. They play a crucial role in increasing the reaction rate by providing an alternative reaction pathway with lower activation energy. The correct statement about solid catalysts is option D, which states that the same reactants may give different products by using different catalysts. Let's understand this statement in detail.

**1. Role of catalysts:**
A catalyst is a substance that increases the rate of a chemical reaction by lowering the activation energy required for the reaction to occur. It does not undergo any permanent change during the reaction and is not consumed in the process. Catalysts provide an alternative pathway for the reaction, which has a lower activation energy, allowing the reaction to occur at a faster rate.

**2. Specificity of catalysts:**
Different catalysts have different structures and compositions, which impart them with unique catalytic properties. The choice of catalyst can significantly influence the outcome of a reaction. Catalysts can exhibit specificity towards certain reactions or certain reactants, leading to the formation of specific products.

**3. Influence on reaction pathway:**
Catalysts can influence the reaction pathway by providing an alternative mechanism. They can stabilize reactive intermediates, facilitate bond breaking or formation, or modify the electronic structure of the reactants. These changes in the reaction pathway can result in the formation of different products.

**4. Selectivity of catalysts:**
Catalysts can also exhibit selectivity, which refers to their ability to favor the formation of specific products over others. This selectivity can be achieved through various mechanisms such as shape selectivity, size selectivity, or electronic effects. Different catalysts can have different selectivities, leading to the formation of different products from the same set of reactants.

**5. Importance of catalyst choice:**
Choosing the right catalyst is crucial in many industrial processes. The catalyst should not only increase the reaction rate but also produce the desired products selectively. The same reactants may undergo different reaction pathways and yield different products when different catalysts are used.

In conclusion, the statement that same reactants may give different products by using different catalysts is correct. Catalysts can influence the reaction pathway and exhibit selectivity, leading to the formation of different products. The choice of catalyst plays a significant role in determining the outcome of a reaction.