Non-impact printers, as the name suggests, do not involve any physical contact with the paper while printing. They are generally faster, quieter, and produce higher-quality prints compared to impact printers. Among the given options, option 'C' - Laser Printer, is a non-impact printer. Let's understand why the other options are not non-impact printers.

1. Drum Printer:
A drum printer is an impact printer that uses a rotating drum with characters embossed on its surface. When the drum rotates, the characters strike the paper through an inked ribbon, leaving an impression. The impact of the characters on the paper makes it an impact printer, not a non-impact printer.

2. Chain Printer:
A chain printer is another type of impact printer that uses a chain of characters. The chain is rotated, and the desired character is selected and brought into contact with the paper through an inked ribbon. Again, the physical impact between the characters and the paper classifies it as an impact printer.

3. Laser Printer:
A laser printer is a non-impact printer that uses the principles of laser technology to produce high-quality prints. It utilizes a laser beam to create an electrostatic image on a drum, which is then transferred onto the paper using toner. The toner is fused onto the paper using heat, resulting in a permanent print. Since there is no physical impact involved in the printing process, laser printers are classified as non-impact printers.

In conclusion, among the given options, only the laser printer (option 'C') is a non-impact printer. Drum printers and chain printers (options 'A' and 'B') are examples of impact printers.