<u>Answer:</u> The correct answer is d-block.
<u>Explanation:</u>
Chromium is the 24th element of the periodic table. It belongs to period 4 and Group 6 of the periodic table.
The number of electrons present in this element are 24 because number of electrons is equal to the atomic number of the element.
Electronic configuration of this element is:
As, the last electron is entering the d-orbital. Hence, this element belongs to d-block of the periodic table.