Its number 1) the semicolon one
She is comparing since she is looking at the different boxes and comparing the grams of sugar
What do you mean? I don't get it.
The sentence that best represents the function of a supporting sentence is, option B. It adds more details to the topic sentence. The supporting sentences make up the paragraph that talks about the main sentence. The supporting sentences not only add more information about the topic, but also add examples to further explain the main sentence.