Concept:These words are often confused because they sound similar, but their meanings are different: "insure" relates to financial protection, "ensure" means to make certain, and "unsure" means not certain.
Explanation:Sentence 1: "One should be wary of visiting websites they are unsure of."
Here, "unsure" means "not certain", which fits perfectly because a person may be uncertain about a website's safety. So this usage is correct.
Sentence 2: "Meena says she always tries to insure that she has some loose cash in her handbag."
"Insure" is used when talking about protection through insurance. The intended meaning is to make certain about having cash, so the correct word should be "ensure". This usage is incorrect.
Sentence 3: "Kewal was ensure of the possible consequences of his decision."
"Ensure" is a verb and cannot be used after "was" as an adjective. The correct phrase would be "was sure of" or "was unsure of". Therefore, this usage is incorrect.
Only sentence 1 uses the given word correctly.
Answer:Option C: 1 only.