A sentence has been given with a blank to be filled with an appropriate…

Completed sentence: Older people face many issues with the advancement of technology.

Explanation: "Older" is an adjective used before the plural noun "people" to describe a group of people who are relatively advanced in age. It does not need an article in this position and fits the sentence naturally.

• "Oldest": This is a superlative and usually requires a definite article or specific context (for example, "the oldest people"). It does not fit the blank as written.

• "an old": This phrase is singular and needs a singular noun (for example, "an old person"). It cannot directly modify the plural noun "people."

• "Older": Correct choice. Used attributively before "people" to indicate a group of relatively advanced age without needing an article.

• "Old": Grammatically possible as in "Old people...", but it is more absolute. Given the options and the typical phrasing to refer to a group by relative age, "Older" is the preferred choice.