All of them are correct.
Option A.
The eukaryotic cells in a multicellular organism are specialized to perform certain functions. These cells do adapt to perform their functions easily and efficiently.
In cells like neurons, the plasma membrane are required to transfer the electrical impulse from dendron to axon. But the volume of cell is immaterial for this function. So the cells become long and thin, to perform its soul function.
The villi in small intestine are supplied with cells that has to absorb nutrients from food. This makes the cell have foldings of cell membrane called microvilli to increase the surface area. This is necessary for efficient absorption of nutrients.