The correct answer is option 3: Canada.

Intensive subsistence agriculture is a form of agriculture in which a small amount of land is used to produce a large amount of crops. It typically involves the intensive use of labor and resources to maximize crop yields.

India, Japan, and Indonesia are countries where intensive subsistence agriculture is predominantly practiced. In these countries, due to high population densities and limited arable land, farmers rely on small plots of land and use labor-intensive farming methods to produce enough food for their communities.

However, Canada is not known for practicing intensive subsistence agriculture. Canada has vast expanses of arable land and a relatively low population density. As a result, Canadian agriculture is largely focused on commercial farming and the production of cash crops, such as wheat, canola, and soybeans. Farming methods in Canada typically involve the use of machinery and advanced technologies to optimize productivity.

In conclusion, while intensive subsistence agriculture is predominantly practiced in India, Japan, and Indonesia, it is not the main form of agriculture in Canada.