Environmental laws, labor availability, and access to markets are major factors affecting which of the following?

The factors mentioned - environmental laws, labor availability, and access to markets - majorly affect the location of industries.

1. Environmental Laws: These are the standards that governments establish to manage natural resources and environmental quality. The strictness of these laws can vary from country to country. Industries often choose to set up in regions where these laws are less strict to reduce the cost of operation.

2. Labor Availability: Industries often set up in areas where there is an abundance of labor. This is especially true for industries that are labor-intensive. The cost of labor can also affect this decision. If labor is cheaper in a particular area, industries might choose to set up there to reduce costs.

3. Access to Markets: Industries prefer to set up close to their target markets. This reduces the cost of transportation and allows the industry to respond quickly to changes in demand.

So, these factors play a crucial role in deciding the location of industries.