Are used to separate items in a long and detailed list or to join two closely related ideas?

off the top of my head, at risk of sounding dumb, a comma?

a. commas
b. colons
c. semicolons
d. dashes

not sure if this is tricking me either? is it that simple?

Which excerpt from the awakening best highlights the elation edna feels when she thinks of robert? the morning was full of sunlight and hope. edna could see before her no denial—only the promise of excessive joy. she lay in bed awake, with bright eyes full of speculation. “he loves you, poor fool.” he would come to her in the afternoon or evening, sit and roll his cigarette, talk a little, and go away as he had done the night before. but how delicious it would be to have him there with her! robert did not come that day. she was keenly disappointed. he did not come the following day, nor the next. each morning she awoke with hope, and each night she was a prey to despondency. his horses were full of mettle, and even a little unmanageable. she liked the rapid gait at which they spun along, and the quick, sharp sound of the horses' hoofs on the hard road.

In brave new world why does bernard dislike henry ford?

Why might a reader look for an idea that is restated? to craft a summary of the article to find the subheadings in the article to identify the article's main idea to locate the article's key support