|Question 21Verbal

Source Texts

Text
Every US state has an associated state soil, which is typically selected by a group of experts, then passed through the state legislature to receive its official designation. For example, Arkansas's Stuttgart soil was formally designated in 1997, and Maine's Chesuncook soil in 1999. ______ years pass between a soil's selection and official designation, as the legislative process can be notoriously slow.
Which choice completes the text with the most logical transition?
Often,
A
Therefore,
B
Similarly,
C
Indeed,
D