Organic molecules contain carbon and inorganic molecules don't contain carbon. So, we can analyse the molecules' composition and understand if they are organic or inorganic.
In the image below we can see and example of a glucose molecule:
As we can see, it presents carbon (C) in its composition, therefore glucose is an organic molecule.
Oxygen is an element in itself, represented by the letter O, therefore it does not presents carbon (C) in its composition and it is inorganic.
Water is a molecule represented by the image below:
As we can see, it is composed only of Hydrogen (H) and Oxygen (O), so it does not include carbon (C) and it is an inorganic molecule.
At last, we can see in the next image a carbon dioxide molecule:
We can see that it does present the carbon (C) element, so it is an organic molecule.
Therefore, we can say that carbon dioxide and glucose are organic molecules, water is an inorganic molecule and oxygen is an inorganic element. Analysing these facts, the correct answer is 1) A: oxygen and water / B: glucose.