The set of chairs meant for use by Ejike's categorized as

Let's solve these:

3. The set of chairs Ejike took to his shop is classified as A. consumer goods. B. unsought goods. C. shopping goods. D. industrial goods.

   The correct option is D. Industrial goods are products used in the production of other goods or for business operations. Since Ejike took the chairs to his shop, they are likely for business use.

   $$\boxed{\text{D}}$$

4. The set of chairs meant for use by Ejike's son is categorized as A. consumer products. B. unsought products. C. convenience goods. D. industrial goods.

   The correct option is A. Consumer products are goods purchased by individuals for personal use. Since the chairs are for Ejike's son, they fall under this category.

   $$\boxed{\text{A}}$$