Identify the most reactive metal.

Options

A. Iron
B. Gold
C. Zinc
D. Potassium

Explanation

To identify the most reactive metal among the given options, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify the most reactive metal from the given options: A) Iron, B) Gold, C) Zinc, D) Potassium.

2. **Know the Reactivity Series**: The reactivity series is a list that ranks metals based on their reactivity from most reactive to least reactive.

3. **List the Given Metals**: From the options provided:
- A) Iron (Fe)
- B) Gold (Au)
- C) Zinc (Zn)
- D) Potassium (K)

4. **Refer to the Reactivity Series**: The reactivity series is as follows (from most reactive to least reactive):
- Potassium (K)
- Sodium (Na)
- Lithium (Li)
- Barium (Ba)
- Strontium (Sr)
- Calcium (Ca)
- Magnesium (Mg)
- Aluminium (Al)
- Manganese (Mn)
- Zinc (Zn)
- Chromium (Cr)
- Iron (Fe)
- Cobalt (Co)
- Nickel (Ni)
- Tin (Sn)
- Lead (Pb)
- Hydrogen (H)
- Bismuth (Bi)
- Copper (Cu)
- Mercury (Hg)
- Silver (Ag)
- Gold (Au)
- Platinum (Pt)

5. **Identify the Most Reactive Metal**: Looking at the reactivity series, we can see that Potassium (K) is at the top, indicating that it is the most reactive metal among the options provided.

6. **Conclusion**: Therefore, the most reactive metal from the given options is **D) Potassium**.

### Final Answer:
**D) Potassium**