Answer:
3. increase the demand for construction workers.
Explanation:
It would be in the interest of construction workers if there were many construction projects ongoing or in the pipeline. The projects creates employment opportunities for the workers. More projects will require more workers, which increases the demand for construction workers.
The purpose of lobbying for greater spending in highways and public buildings is, therefore, to create a continuous supply of work in the construction industry. The demand for workers increases when the government increases its spending on buildings and highways.