the most difficult vs the less difficult

[Kukus]

English Language Tests, Intermediate level

ESL/EFL Test #99 "Student Teacher Dialogue (2)", question 3

Teacher: Very good. Which do you find the ......... difficult?

(a) worst
(b) best
(c) less
(d) most

English Language Tests, Intermediate level

ESL/EFL Test #99 "Student Teacher Dialogue (2)", answer 3

Teacher: Very good. Which do you find the most difficult?

Correct answer: (d) most
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less?

Kukus

[Beeesneees]

most difficult.... hardest of all.
If the teacher was asking about the easiest, then it would be:
"Which do you find the least difficult?" 'least' is not an option, so it must be 'most'.
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Cheers m' dears!