1 ) because the infrastructure was crumbling and became dangerous for drivers .
2) ..................
sorry , I am not really sure about the answer for question 2 but I hope the first answer will help .
So please , if you disagree you can delete my answer .
Answer: D
Explanation: The theory that suggests this is letter D, the social investment model.
This model suggests that commitment to something is influenced by three aspects: satisfaction levels, quality of alternatives and investment size. As long as both partners feel satisfied with each other, alternatives seem not likeable and they continue to invest in their relationship, they will last longer.
The correct answer is incompressible. Liquids or fluids that behave under pressure are called incompressible fluids because they tend to behave through flowing movements. An example of an incompressible fluid is the lava which comes out of a volcano where once out of the atmosphere becomes dense and flows at a constant volume and velocity.