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A
Modern
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B
No longer used or outdated
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C
Hidden
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D
Expensive
Why this is the answer
OBSOLETE means no longer produced or used; out of date. Example: 'Floppy disks are obsolete technology.' From Latin 'obsoletus' (worn out, decayed). Synonyms: outdated, antiquated, archaic, outmoded, defunct, passé. Antonyms: modern, current, contemporary, up-to-date, novel, recent. Related: OBSOLESCENCE (the state of becoming obsolete); PLANNED OBSOLESCENCE (a manufacturing practice of designing products to become obsolete). Technology-related vocabulary common on the ASVAB: INNOVATIVE (new and inventive), CUTTING-EDGE (at the forefront), STATE-OF-THE-ART (using the most advanced techniques), MODERN, CONTEMPORARY, ANTIQUATED, ARCHAIC, OBSOLETE, DEFUNCT (no longer existing or functioning). Distinction: OBSOLETE means no longer used (a thing has been replaced); EXTINCT means no longer existing (especially of species); DEFUNCT means no longer functioning (often used of businesses or organizations). The shades of meaning are tested on ASVAB.
Source: ASVAB WK — Time-Related Vocabulary