Explanation:

Units of Measurement:

Units of measurement are the standards used to express the quantity of any physical entity. These units help in measuring the length, weight, capacity, and temperature, etc. Different countries have different systems of units of measurement. However, the International System of Units (SI) is the most widely used system of units of measurement throughout the world.

Ancient Units of Measurement:

In ancient times, people used different units of measurement. Some of the ancient units of measurement are:

1. Angul:
- An angul is a unit of measurement used in ancient India.
- It is equivalent to the width of a finger or thumb.
- It is approximately equal to 1.75 cm or 0.69 inches.

2. Cubit:
- A cubit is an ancient unit of measurement used in many parts of the world.
- It is the distance between the elbow and the tip of the middle finger.
- It is approximately equal to 45.7 cm or 18 inches.

3. Girah:
- A girah is an ancient unit of measurement used in India.
- It is used to measure the length of cloth.
- It is approximately equal to 0.9144 meters or 1 yard.

Not an Ancient Unit of Measurement:

The option 'B' - Meter is not an ancient unit of measurement.
- The meter is a unit of measurement used in the International System of Units (SI).
- It is the standard unit of length.
- The meter is defined as the distance traveled by light in a vacuum in 1/299,792,458 of a second.
- It was first introduced in 1795 in France as a unit of length.

Conclusion:

Hence, the correct answer is option 'B' - Meter as it is not an ancient unit of measurement.

Girah, Cubit and Angul are ancient unit of measurement while meter is SI unit of measurement.