Read Paragraph Below and Answer the Questions That Follow It

Read paragraph below and answer the questions that follow it.
(1) Kudzu is an invasive plant causing great harm in the United States, but it was brought here on purpose and cultivated. (2) In 1876, this Japanese vine with fragrant blossoms was shown at the 100^th anniversary of the United States. (3) Americans were enchanted, and some recommended planting it as a garden plant, animal feed, or erosion control. (4) The trouble was that kudzu grew too well. (5) Known as mile-a-minute vine, it raced over fields, climbing trees and strangling the life out of all greenery in its path. (6) Its roots, which must be destroyed to kill it, run wide and deep. (7) In 1970, the U.S. declared kudzu a weed and in 1997, a noxious weed. (8) This vine that started in the South now covers over 7 million acres, blanketing forests as far North as New England. (9) Incredibly, kudzu is ranked as one of the five worst invasive species in the U.S., ahead of killer bees and Burmese pythons.
-Which of the following sentences contains a transitional expression that indicates time?

A) Sentence 2
B) Sentence 3
C) Sentence 5
D) Sentence 9