(EEAr - 2015) Prepositions

Laura had parked her car __________ a local shopping mall, and she was taking a shortcut through the side door __________ a restaurant. Halfway across the restaurant, she spotted her father eating a hamburger and French fries; he often eats there. She sneaked up behind him, put her hand over his shoulder, took a French fry off the plate, dipped it in the ketchup, and ate it. Then she realized that
the man was not her father! She was so embarrassed! She couldn’t say a word!
46 – Fill in the blanks with the correct prepositions,
respectively:
a) in / on
b) on / of
c) at / of
d) at / on
Gabarito : c
Alguém  pode me explicar por que a preposição  que completa a primeira lacuna é  o "at"

At é usado para localizações mais específicas.