Which is the best choice for showing how to join the sentences? swimming races are won by inches. the new suits can make a difference

I would say D) Because swimming races are won by inches, the new suits can make a difference. It's joining a statement and a reason for the statement.

for me i cant do homework without music, so, i guess i would say faster with it, than without it. for me at least.

the author is showing that it is the insatisfaction of basic needs that brings about the protests such as the strikes.if workers do not earn enough to buy food and feed their families and themselves in order to continue working, what is the use of working? besides, another message from the author is that of the owners of factories should be worried about ensuring their furure by having a second and third generation of workers in their industries.if they do not hear the workers demands, they will not have any more workers to make their pockets full.