Option C, because both of them have irregular shape, hence can change their shape.

Explanation:

Introduction:
Cells are the basic structural and functional unit of all living organisms. They have the ability to change their shape in response to various stimuli or to perform specific functions. Some cells have a flexible cytoskeleton or cell membrane that allows them to change shape easily. In this context, the options given are amoeba cells and white blood cells (WBCs). Let's discuss each of these cell types and their ability to change shape.

Amoeba Cells:
Amoeba cells are single-celled organisms belonging to the group of protozoans. They are famous for their ability to change shape. Amoebas have a flexible cell membrane and a cytoplasmic structure called the ectoplasm and endoplasm. The ectoplasm is a gel-like outer layer that can form temporary extensions called pseudopodia (false feet). These pseudopodia allow amoebas to move, capture food, and engulf prey. As the amoeba extends its pseudopodia in the direction it wants to move, the rest of the cell follows, resulting in a change in shape. Therefore, amoeba cells are capable of changing their shape.

White Blood Cells (WBCs):
White blood cells, also known as leukocytes, are an essential part of the immune system. They are responsible for defending the body against infectious agents and foreign substances. WBCs are produced in the bone marrow and circulate throughout the body in the bloodstream. When they encounter an infection or inflammation, they can migrate out of the bloodstream and into the tissues.

WBCs have the ability to change their shape in a process called amoeboid movement. This movement is similar to the way amoeba cells move. The WBCs extend pseudopodia, allowing them to squeeze through narrow gaps between endothelial cells lining blood vessels. This enables them to migrate towards the site of infection or inflammation. The ability of WBCs to change shape is crucial for their function in the immune response.

Conclusion:
Both amoeba cells and white blood cells (WBCs) have the ability to change their shape. Amoeba cells use pseudopodia to move and capture food, while WBCs use amoeboid movement to migrate towards sites of infection or inflammation. Therefore, the correct answer is option 'C' - both of these cells can change their shape.