From the underlined word or phrases A, B, C, or D, identify the one that is not correct.
Compact discs, which (A) appeared on the market in the early 1980s, produce (B) sound of better quality than those (C) of standard phonograph D) records.
The Pony Express began at a time when (A) not (B) railway went farther C) west than (D) the Mississippi and Missouri Rivers.
The Homestead Act of 1862 granted 160 acres of land to any (A) settler which B) would (C) spend five years on (D) the land.
Dust storms occur however (A) wind erosion is strong (B) and loose material (C) is (D) exposed.
Pewter ranks (A) as one of the oldest known (B) alloys and may have (C) been used as early as 1500 B.C. ago (D).
Warm (A) and moisture help microbes grow (B) and thus (C) assist the decay (D) process.
Morse (A) code was an (B) important way to send messages (C) before the telephone and radio are (D) invented.
Many plains, such (A) the Great Plains in the United States, have few (B) trees because of (C) dry or cold climate (D).
Much (A) psychologists do not associate themselves (B) with (C) a particular (D) school or theory.