What is the most important point in the following sentence? My sister, Emily, the tallest girl in her class, has many friends.A. Emily has many friends.B. Emily is the tallest girl in her class.C. My sister's name is Emily.D. Emily is my sister.
The words after the two first commas are just words to express her sister and, even if you perceive these words out of the sentence, the structure of the sentence is still present. The other parts are all supporting information. They are not giving the main information and are not describing the central theme.
