That "dot" is called a tittle or a superscript dot . A tittle or a superscript dot is a small distinguishing mark, it shows in the lower case letter(s) i or j. The tittle is an integral part of the glyph of i and j, but diacritic dots can appear over other letter in various languages.
B. "They were ballet dancers twirling in <span> the wind." </span> Is your answer. A metaphor is like when you are more comparing something to something. A simile would be like "my dog is as smelly as my socks"