That was a ____ research job you did for the company.

A) fantastic
B) fantasy
C) fantasize
D) fantastical

The answer key says A is correct. I checked the dictionary and found D) equals A). Is this an idiomatic issue ? Please advise.

"Fantastic" means:

1) imaginative or fanciful; remote from reality
• of extraordinary size or degree
• (of a shape or design) bizarre or exotic; seeming more appropriate to a fairy tale than to reality or practical use

2) extraordinarily good or attractive

"Fantastical" only shares the meaning of 1) - not of 2)

... That's why only A) is the correct answer.
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I see. Thank you very much.

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 BarbaraPA's reply was promoted to an answer.