Difference between acceptable and considerable

[amna]

Test No. incompl/inter-70 "How to criticize", question 7

I'm afraid to tell you that your standard of work has fallen well below what we think is ..........

(a) considerable
(b) believable
(c) acceptable
(d) available

Test No. incompl/inter-70 "How to criticize", answer 7

I'm afraid to tell you that your standard of work has fallen well below what we think is acceptable.

Correct answer: (c) acceptable
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both a & c might be correct answers

[Torsten]

No, only acceptable is correct here. Considerable doesn't work because it means sizeable or substantial.
In all of our tests only answer option is correct.
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