The given sentence informs that the security guard needs shoes. Among the given options, 'pair' fits in the blank as it gives the meaning that the security guard requires both shoes in a pair ('a set of two things used together or regarded as a unit').
The correct sentence is: The security guard needs a pair of shoes.
Hence, option (d) is the answer.
Pare - trim (something) by cutting away its outer edges.
Pear - a yellowish- or brownish-green edible fruit that is typically narrow at the stalk and wider towards the base, with sweet, slightly gritty flesh.
Payor - a person who pays.
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