Which is the most accurate clock?

Explanation

### Step-by-Step Solution:

1. **Understanding the Concept of Accuracy in Clocks**:
- Accuracy in clocks refers to how close the clock's timekeeping is to the actual time. The more accurate a clock is, the less it deviates from the true time.

2. **Types of Clocks**:
- There are various types of clocks, including mechanical clocks, quartz clocks, atomic clocks, and optical lattice clocks. Each type has a different level of accuracy.

...