Meaning of 'story line'

[yasmine]

English Language Tests, Intermediate level

ESL/EFL Test #55 "Hear my Story", question 8

It's a brilliant film as far as the images are concerned but the story ......... is a bit weak.

(a) theme
(b) thread
(c) tendency
(d) line

English Language Tests, Intermediate level

ESL/EFL Test #55 "Hear my Story", answer 8

It's a brilliant film as far as the images are concerned but the story line is a bit weak.

Correct answer: (d) line

Your answer was: incorrect
It's a brilliant film as far as the images are concerned but the story theme is a bit weak.
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what does "story line" mean?

thank you
yasmine

[Conchita]

The story line is the plot or basic story of a book, play, film or novel.