Difference between lorry and truck

[Lomak]

Test No. incompl/inter-45 "Speaking 2 (At the Supermarket)", question 3

We ask the ......... of this vehicle to go back to their car as soon as possible and park their car in another space.

(a) possessor
(b) possessing
(c) ownership
(d) owner

Test No. incompl/inter-45 "Speaking 2 (At the Supermarket)", answer 3

We ask the owner of this vehicle to go back to their car as soon as possible and park their car in another space.

Correct answer: (d) owner
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wha's lorry?

Lomak

[Alan]

What's a lorry? A large vehicle used for transporting heavy goods/materials
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English as a Second Language
You can read my ESL story A day in the life of a flat hunter

[Rich7]

British for the American truck.

[Saneta]

Please tell me when we can use possessor and when onwer?, because these two words mean the same.
Can we say: the possessor of that vehicle?
Thanks.