Sentence I: Correct usage. Here, "ruined" is the past participle of the verb "ruin", meaning to destroy or spoil something completely. The sentence correctly describes how modern hotels have spoiled the natural state of the coastline.
Sentence II: Correct usage. "Ruin" is used as a noun here, referring to a state of complete financial loss or collapse. The sentence accurately conveys the vulnerability of the workers.
Sentence III: Correct usage. "Ruins" as a plural noun here refers to the remains of a building or place that has been destroyed or decayed over time. The sentence appropriately describes the remnants of an ancient temple.
All three sentences use different forms of the word "ruin" appropriately.
Hence, option (a) is the answer.
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