Option 1 suggests Aluminium, which is incorrect as Ilmenite and Rutile are not known to have significant Aluminium content.

Option 2 proposes Copper, which is also incorrect as these minerals are not key sources of Copper.

Option 3 proposes Iron, which might be partially correct as Ilmenite contains iron, but it`s not the main metal derived from this mineral.

Option 4, the correct answer, suggests Titanium. Ilmenite and Rutile are indeed rich sources of Titanium. Rutile is one of the most common naturally occurring forms, and Ilmenite often serves as an important source of Titanium by processing it to remove Iron and other impurities. Therefore, these minerals are particularly important in the manufacture of Titanium-based products.

So, the abundant availability of ilmenite and rutile in certain coastal tracts of India contributes significantly to the country`s Titanium resource base.