Someone help with these please ASAP I’m taking the test

What is the meaning of the statement that all is vanity or meaningless? use full sentences

The telegraph, the transatlantic telegraph cable, and the telephone were important to businesses after 1850 because of a. they created a system for developing new inventions. b. they filled a need that other inventions of the day could not. c. they attracted investors and created the stock market. d. they made picture-taking a popular american pastime.

Identify a reason for the decline of the roman empire.