What does 'merchandise on the display' mean?

[Hondy]

Business English Lesson, Advanced Level

ESL/EFL Test #190 "Retail Marketing", question 5

Retailers, who are always keeping an eye on the bottom line, continually search for ways to speed up the rate at which they put manufacturers' merchandise on the ..........

(a) aisle
(b) display
(c) floor
(d) pallet

Business English Lesson, Advanced Level

ESL/EFL Test #190 "Retail Marketing", answer 5

Retailers, who are always keeping an eye on the bottom line, continually search for ways to speed up the rate at which they put manufacturers' merchandise on the floor.

Correct answer: (c) floor
_________________________

Why can't I use display? merchandise on the display?? Thanks

[Mister Micawber]

Because the English idiom is 'on display' (no 'the').
_________________
Native English teacher at Mister Micawber's