The correct answer is C) Although.
The sentence would read: "The author examined the environmental effects although the economic effects were just as significant." This shows a contrast between the two types of effects.
Da uthor examined da envrionmental effects _____ da economic effects were just as significant
A ) Likewise
B ) Similarly
C ) Although
D ) Furthermore
1 answer
The correct answer is C) Although.
The sentence would read: "The author examined the environmental effects although the economic effects were just as significant." This shows a contrast between the two types of effects.