_____ is an example of a secondary activity.
A) Trade
B) Education
C) Grazing
D) Production of sugar from sugarcane

Hint: A secondary activity is an activity that is performed by a unit in addition to its principal activity. The result of a secondary activity is known as secondary production.

Complete answer:
A secondary activity is also known as peripheral activities. These activities include construction and manufacturing. By changing the form of products, these activities add value to already existing products, making them more suitable for our wants and needs. These activities produce finished products. By using products of primary activities as raw materials, the occupations that produce finished goods are included in the secondary activity. Manufacturing of clothes from cotton, steel from iron ore, and sugar from sugarcane are some of the examples of secondary activities. All these activities are secondary activities because the final product has to be produced by men, not by nature, and therefore, some process of manufacturing is necessary. Let us take the example of cloth. Though the primary product, that is the cotton, is produced by nature, it cannot be used directly by us. So to convert cotton into usable form some process of manufacturing is required. This can be done at home or in a factory.
Some of the secondary sector activities are automobile production, metalworking, and smelting, chemical and engineering industries, energy utilities, textile production, aerospace manufacturing, engineering, breweries and bottlers, construction, and shipbuilding.
So, the correct answer is Option D.

Note: Primary activities include fishing, hunting, agriculture, mining etc. These activities are concerned with materials that are obtained directly from nature. These activities produce raw materials. The production of goods depends on natural factors.