The correct answer is C. Line printer.
A line printer is a type of printer that prints an entire line of text at once, as opposed to character-by-character or page-by-page. Line printers were once the most common type of printer, but they have been largely replaced by laser printers and inkjet printers.
Line printers work by using a print head that moves across the page, printing one character at a time. The print head is made up of a series of pins that are dipped in ink. When the print head is over the correct character on the page, the pins are raised and ink is deposited on the paper.
Line printers are typically used for printing large amounts of text, such as reports or invoices. They are also used for printing labels and other types of documents that require a lot of characters to be printed.
The other options are incorrect because they are not types of printers that print an entire line of text at once.
A thermal printer is a type of printer that uses heat to create an image on paper. Thermal printers are often used for printing receipts and barcodes.
An electrostatic printer is a type of printer that uses electricity to create an image on paper. Electrostatic printers are often used for printing high-quality documents.
An inkjet printer is a type of printer that uses ink to create an image on paper. Inkjet printers are the most common type of printer in use today.
None of the above is the correct answer because it is not a type of printer that prints an entire line of text at once.