Q:Information: - E. I. du Pont de Nemours and Company, commonly referred to as DuPont, is an American conglomerate that was founded in July 1802 as a gunpowder mill by French-American chemist and industrialist Eleuthere Irenee du Pont. - String instruments, stringed instruments, or chordophones are musical instruments that produce sound from vibrating strings when the performer plays or sounds the strings in some manner. - An amide (or or ), also known as an acid amide, is a compound with the functional group RE(O)NR (R and R refer to H or organic groups). Most common are carboxamides (organic amides) ("n"=1, E=C, "x"=1), but many other important types of amides are known, including phosphoramides ("n"=2, E=P, "x"=1 and many related formulas) and sulfonamides (E=S, "x"=2). The term amide refers both to "classes of compounds" and to the "functional group" (RE(O)NR) within those compounds. - The DuPont Experimental Station is the largest research and development facility of E. I. du Pont de Nemours and Company. Located on the banks of the Brandywine Creek in Wilmington, Delaware, it is home to some of the most important discoveries of the modern chemical industry. The Experimental Station is a more recent part of the DuPont legacy and is located on the DuPont Historic Corridor. - Nylon is a generic designation for a family of synthetic polymers, more specifically aliphatic or semi-aromatic polyamides. They can be melt-processed into fibers, films or shapes. The first example of nylon (nylon 6,6) was produced on February 28, 1935, by Wallace Carothers at DuPont's research facility at the DuPont Experimental Station. Nylon polymers have found significant commercial applications in fibers (apparel, flooring and rubber reinforcement), in shapes (molded parts for cars, electrical equipment, etc.), and in films (mostly for food packaging).<ref name="Materials/Polyamide"></ref> - HornbostelSachs or SachsHornbostel is a system of musical instrument classification devised by Erich Moritz von Hornbostel and Curt Sachs, and first published in the "Zeitschrift fur Ethnologie" in 1914. An English translation was published in the "Galpin Society Journal" in 1961. It is the most widely used system for classifying musical instruments by ethnomusicologists and organologists (people who study musical instruments). The system was updated in 2011 as part of the work of the Musical Instrument Museums Online (MIMO) Project. - A polyamide is a macromolecule with repeating units linked by amide bonds. - The ukulele ( / jukleli / ew - k - LAY - lee , from Hawaiian : ukulele ( ukull ) ( oo - koo - leh - leh ) ; variant : ukelele ) sometimes abbreviated to uke , is a member of the lute family of instruments ; it generally employs four nylon or gut strings or four courses of strings . The ukulele originated in the 19th century as a Hawaiian adaptation of the Portuguese machete , a small guitar - like instrument , which was introduced to Hawaii by Portuguese immigrants , many from Madeira and the Azores . It gained great popularity elsewhere in the United States during the early 20th century , and from there spread internationally . The tone and volume of the instrument vary with size and construction . Ukuleles commonly come in four sizes : soprano , concert , tenor , and baritone . - Wallace Hume Carothers (April 27, 1896 April 29, 1937) was an American chemist, inventor and the leader of organic chemistry at DuPont, credited with the invention of nylon. - A fret is a raised element on the neck of a stringed instrument. Frets usually extend across the full width of the neck. On most modern western fretted instruments, frets are metal strips inserted into the fingerboard. On some historical instruments and non-European instruments, frets are made of pieces of string tied around the neck. - Lute can refer generally to any string instrument having the strings running in a plane parallel to the sound table (in the HornbostelSachs system), more specifically to any plucked string instrument with a neck (either fretted or unfretted) and a deep round back, or more specifically to an instrument from the family of European lutes. After reading the paragraphs above, we are interested in knowing the entity with which 'ukulele' exhibits the relationship of 'subclass of'. Find the answer from the choices below. Choices: - acid - c - chemistry - company - conglomerate - element - family - functional group - group - invention - leader - lute - metal - mill - musical - musical instrument - part - people - performer - plucked string instrument - polyamide - project - research - society - sound - station - study - system - table - translation - western - work
A:
plucked string instrument