The question reflects on emergent properties, which, by definition, are the properties of a group of items.
On the first question, when combining two substances with different properties we can't completely predict what will be the characteristics of the newly formed substance, as stated in the text that introduces the question. Therefore, the best option would be letter d, "Not possible to predict with the information given".
When talking about emergent properties, we are considering the properties of a group of items, whether these items are objects, atoms or molecules. In that sense, it only makes sense to talk about the boiling point of ethanol when there is more than one molecule - in a liquid form, for example, there are many molecules of ethanol and the boiling point corresponds to the temperature where the vapor pressure of the liquid (a "group" of ethanol molecules) equals the atmosphere vapor pressure, and the interactions between these molecules start to change. Therefore, the best option would be letter d, "No, because the properties of a substance only emerge when atoms are grouped together"