|Question 3Verbal

Source Texts

Text
Although our knowledge of the Pliocene epoch and the lives of hominids during this time was once       , recent analyses of fossils like that of the individual known as LH 4, discovered in Tanzania in 1974, have sharpened our picture of what a day in the life of LH 4 may have looked like.
Which choice completes the text with the most logical and precise word or phrase?
unprecedented
A
nebulous
B
intricate
C
concrete
D