A deutron contains

Options

A. A neutron and a positron
B. A neutron and a protons
C. A neutron and two protons
D. A proton and two neutrons

Explanation

To answer the question "A deuteron contains," we need to understand what a deuteron is and its composition.

### Step-by-Step Solution:

1. **Understanding Deuterium**:
- Deuterium is an isotope of hydrogen. While regular hydrogen (protium) has one proton and no neutrons, deuterium has one proton and one neutron.

2. **Defining a Deuteron**:
- A deuteron is the nucleus of deuterium. Therefore, it consists of:
- 1 proton
- 1 neutron

3. **Summarizing the Composition**:
- Thus, a deuteron contains a total of 2 nucleons (1 proton + 1 neutron).

4. **Conclusion**:
- Therefore, the answer to the question "A deuteron contains" is: **1 proton and 1 neutron**.

### Final Answer:
A deuteron contains **1 proton and 1 neutron**.