The primary purpose in creating national parks is to protect the land from development and pollution provide locations for family-friendly vacations provide jobs to forest rangers create nature-themed amusement parks

The primary purpose in creating national parks is to protect the land from development and pollution.

Explanation:

National parks are owned by the national government. This areas are strictly reserved for habitat of wild animals.

The main purpose for creating national parks is to reserve some space for nature. This area is protected from pollution and development.

Thus, answer for given question is protect the land from development and pollution.