28. Most of the world's coastalcities were establishedduring the last fewmillennia, a period whenglobal sea level has beennear constant. Since themid-19th century, sea levelhas been rising, most likelyas a result of human induced climate change.During the 20th century,sea level rose by roughly:
(A)1.5 to 2.0 mm/year
(B)1.5 to 2.0 cm/year
(C)10 cm/year
(D)50 cm/year