For both physical and psychological measurement, the lowest scale of measurement involves categorizing the stimulus into one of a number of discrete categories (e. g., whether or not someone makes eye contact). This level of measurement is called:

Nominal scale

Explanation:

It is necessary for researchers to quantify responses in a meaningful way.

For example, the level of discomfort a person is feeling can be represented by a scale

1: Mild

2: Moderate

3: Severe

Statistical methods can be applied to the set of responses from different people. The conclusion of their hypothesis can be reached through this process.

Hence, the question is referring to nominal scale.

muslims have taken his goods and products to different parts of asia an indonesia. sometimes just traveled and trade, but in other occasions, stayed in the place and made a living.

trade was the key for muslims economies to prosper. their commerce routes reached far places like malaysia and java in the 11th century.

another important factor for prosperity was that muslim states served as the middle point for european traders.

they used to travel by land but sailing the seas -the indian ocean- really increase the exportation of products.

the answer your looking for is c. : )