Which of the following is a class?

Options

A. Mammalia
B. Sapindales
C. Primata
D. Poales

Answer

To determine which of the given options is a class, we will analyze each option:

1. **Memelia**:
- Memelia (more commonly spelled as Mammalia) is indeed a class. It includes all mammals, which are characterized by their ability to nourish their young with milk, being warm-blooded, and having bodies that are generally divided into head, neck, trunk, and tail. There are approximately 4,500 living species of mammals.

2. **Sapindales**:
- Sapindales is not a class; it is an order of dicotyledonous flowering plants.

3. **Primata**:
- Primata is also not a class; it is an order within the class Mammalia. It includes primates like monkeys, apes, and humans.

4. **Poils**:
- Poils (more commonly spelled as Poales) is an order of monocot flowering plants and is not a class.

Based on this analysis, the only option that is a class is **Memelia**.

### Final Answer:
The correct answer is **Memelia**.