Six !
Just count each element in the molecule (Since there are 4 hydrogen atoms, a carbon and an oxygen atom in this molecule of methanol.)
The pair of elements that will form an ionic bond are Strontium and Chlorine.
Here, Heat is transferring directly from a place to another without direct contact, or particles in series this kind of transfer of heat is known as "Radiation"
In short, Your Answer would be Option C
Hope this helps!
