The tangential as well as radial walls of the endodermal cells have a deposition of water impermeable waxy material suberin in the form of : 

Casparian strips

The correct answer is Option (3) - Casparian strips

In the transverse section of the sunflower root ,the internal tissue organisation is as follows:

The outermost layer is epiblema. Many of the cells of epiblema protrude in the form of unicellular root hairs. The cortex consists of several layers of thin-walled parenchyma cells with intercellular  spaces.

The innermost layer of the cortex is called endodermis. It comprises a single layer of barrel-shaped cells without any intercellular spaces. The tangential as well as radial walls of the endodermal cells have a deposition of water-impermeable, waxy material suberin in the form of casparian strips. Next to endodermis lies a few layers of thick-walled parenchyomatous cells referred to as pericycle.

Initiation of lateral roots and vascular cambium during the secondary growth takes place in these cells. The pith is small or inconspicuous. The parenchymatous cells which lie between the xylem and the phloem are called conjuctive tissue.