Would fluorine's chemical properties resemble those of oxygen or those of chlorine?

chlorine

Explanation:

In the periodic table , elements are placed together in the same group , because of their same chemical and physical properties .

Fluorine is placed in group 17 ,

Oxygen is placed in group 16 .

And ,

Chlorine is placed in group 17.

Therefore , The chemical properties of fluorine resembles the most with Chlorine , rather than oxygen ,

Because as shown above , the Fluorine and Chlorine are placed in common group number 17.

b is the correct

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.