Which of the following statements about desktop and laptop computers are false?

A. Most modern laptop computers have builtin webcams.
B. Desktop computers are not very portable.
C. All desktop computers have built-in touchpad.
D. Laptop computers are rarely supplied with a mouse.

Choose the correct answer from the options given below:

The correct answer is C only.

Let us analyze each statement to determine why only statement C is false:

Statement A: Most modern laptop computers have built-in webcams.
This statement is true. Almost all modern laptops designed for consumer or business use come equipped with a small camera (webcam) integrated into the bezel above the screen to facilitate video conferencing and calls.

Statement B: Desktop computers are not very portable.
This statement is true. Desktop computers consist of separate components, such as a large system unit (tower), a separate monitor, a keyboard, and a mouse, along with multiple power and interface cables. Because of their size, weight, and dependence on constant external power, they are designed to remain in a fixed location and are not easily portable.

Statement C: All desktop computers have built-in touchpad.
This statement is false. Touchpads are pointing devices integrated directly into the chassis of laptop computers to replace a mouse. Desktop computers do not have a built-in touchpad; instead, they rely on external input devices, typically a physical mouse connected via USB or wireless signal.

Statement D: Laptop computers are rarely supplied with a mouse.
This statement is true. Laptops are designed to be self-contained, portable units and are equipped with built-in trackpads/touchpads for navigation. Consequently, manufacturers rarely include an external mouse in the standard packaging of a laptop, as users can navigate without one or purchase their own if preferred.

Therefore, since only statement C is false, the option "C only" is the correct choice.