**Explanation:**

When it comes to cooling down food quickly, the choice of material for the plate can have a significant impact. In this case, the correct answer is option 'D' - metal. Here's why:

**1. Conductivity:**
Metal is an excellent conductor of heat. It has high thermal conductivity, which means that it can transfer heat quickly from the hot noodles to the surrounding environment. When the hot noodles come in contact with the metal plate, the heat is rapidly conducted away from the food, causing it to cool down faster.

**2. Surface Area:**
The surface area of the plate also plays a role in the cooling process. Metal plates can be relatively thin and have a larger surface area compared to other materials like wood, paper, or plastic. This larger surface area allows for more heat exchange with the surrounding air, facilitating faster cooling.

**3. Heat Capacity:**
Metal has a higher heat capacity than materials like wood, paper, or plastic. Heat capacity refers to the amount of heat energy a material can absorb. As the hot noodles transfer heat to the metal plate, the plate can absorb more heat energy without significantly increasing its temperature. This allows for efficient cooling of the noodles.

**4. Retention of Heat:**
Unlike materials like plastic or paper, metal plates do not retain heat for a long time. Once the noodles are transferred to a metal plate, the plate quickly dissipates the heat to the surrounding environment, helping the noodles cool down faster. Plastic or paper plates, on the other hand, may retain heat and slow down the cooling process.

In conclusion, a metal plate would be the most effective option for Seema to cool down her noodles faster. Its high thermal conductivity, larger surface area, higher heat capacity, and ability to quickly dissipate heat make it the ideal choice for efficient cooling.