Correction in 10th book edition?

[warten404]

I'm working through the English "Theory Driving Licence B" book, in the Lesson 1 practice questions. One question asks which sign indicates a river bank ahead, showing sign A (movable bridge) and sign B (car going off an edge into water), with the marked answer being C – neither sign A nor sign B.
The car‑into‑water sign is standardly described in English as "quayside *or* riverbank" (your own online materials also list it as "warning for a quayside or riverbank").

so why is the correct answer C?

https://imgur.com/a/k721Ka1

[GRO]

The book with exercices is not from the site.
There are more than 1000 questions on the site.

[warten404]

I thought this is the website that the book is from?
But can someone advise me?
Is that my mistake or the book's?

[GRO]

Answer B is correct.

[warten404]

But then why does the book say C is correct?
https://imgur.com/a/IOOzURq

[GRO]

I only can give you the advice to make exercices on the site. Ther are more than 1000 questions, up to date with the real exam.