Combustion is described as an oxidation reaction.
what happens during combustion?
oxygen gas is given off.
oxygen gas burns during the chemical reaction.
oxygen gas decomposes to produce other elements.
oxygen gas combines with other elements.

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.