Correct option is B
The correct sentence is (b) Middle-class population is increasing along coastlines.
Explanation:
Correct Sentence: Middle-class population is increasing along coastlines.
Analysis of other options:
- This arrangement makes logical and grammatical sense by placing the subject "middle-class population" at the beginning and following it with the predicate "is increasing along coastlines."
- The subject (middle-class population) describes who or what is increasing, while the predicate provides information about the action and location.
- (a) Population middle-class is increasing along coastlines: Incorrect because the word order is awkward and disrupts fluency.
- (c) Along coastlines is increasing population middle-class: Incorrect as it starts with "along coastlines," which should follow the subject.
- (d) Increasing population middle-class along coastlines: Incorrect because it lacks a linking verb ("is").