How has the introduction of the automobile and, subsequently, the highway begun to fundamentally change the way cities are designed and function?

Ibelieve the answer would be a

Some connecting rods have to lubricate the cylinder wall or piston pin. the answer is letter d. graphite coating can be a major  additive to many  coating  systems and things such as connecting rods.  it functions as a refractory, lubricant, thermal conductor, and electrical conductor for a machine or thing to enhance its work.