Choose the letter of the sentence in which the indicated word is used incorrectly.
a. Tides are cyclic with two flood tides and two ebb tides in approximately 24 hours.
b. Because gasoline and automobile tires were scarce during World War II, many Americans rediscovered the bicycle and began to travel cyclically.
c. Many cultures regard time as cyclical, with similar events recurring in different eras rather than once and for all.
d. People in tropical climates do not experience the cyclic nature of the seasons as dramatically as people in temperate zones.