In Kranz anatomy, the bundle sheath cells have: Thin walls, many intercellular spaces and no chloroplasts; Thick walls, no intercellular spaces and large number of chloroplasts; Thin walls, no intercellular spaces and several chloroplasts; Thick walls, many intercellular spaces and few chloroplasts

Kranz anatomy is a specialized type of arrangement of cells in plants like Maize, where two concentric layers of cells are arranged around the vascular bundle. The inner series of cells is thin walled contains large chloroplast with no grana. Therefore carries out only dark reaction or C4cycle. While the outer layer is thick walled due to deposition of suberin and is impervious to gases and water and with no intercellular spaces. So, the correct answer is 'Thick walls, no intercellular spaces and a large number of chloroplasts'