Smartphone normally provides a touch screen interface, which used in phones and tablets, that displays and inserts data on the seen. Nowadays laptops and smartphones are much more comparable to traditional computers on the desktop, In the given question except option c, all option are wrong that can be described as follows:
In option A, It is not correct because all the smart-phones contain CPU which is known as the processor.
In option B, It is not correct because the cell phone is normally used for call purposes only.
In option D, It is not correct because both computers and smartphones have the same computing power.