The prepositions at and in frequently overlap in
locative expressions. However, their selection is
governed by specific spatial and functional
constraints: “In” tends to imply enclosure or
inclusion within a boundary (physical or abstract).
“At” generally denotes a specific point, especially
in directional or functional contexts. Considering
the standard usage of these prepositions in British
and international varieties of English, the sentence
below which demonstrates the most appropriate
and contextually precise usage is: