What is the difference between a molecular formula and a molecular modle?

The molecular formula tell us what elements the atoms are, and how many moles and atoms are attributed toward each element.
The molecular model tells us how the atoms/elements are bonded together.

Molecular formula : CH4

                                  H
                                   l
Molecular model:   H -- C -- H
                                   l
                                  H

The answer is true for your question.

The correct answer is c b c a d