Realize vs. reckon

[Manana]

Test No. incompl/elem-15 "An Easy Question", question 6

Well, I think it is and I ......... it's an impossible question to answer.

(a) deliver
(b) reckon
(c) report
(d) realize

Test No. incompl/elem-15 "An Easy Question", answer 6

Well, I think it is and I reckon it's an impossible question to answer.

Correct answer: (b) reckon

Your answer was: incorrect
Well, I think it is and I realize it's an impossible question to answer.
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Could you explane more

[Alan]

Realize means understand because of what has happened before. In this test, part of a conversation, you need reckon to express the idea of it's my opinion and that is in contrast to what the other speaker says as he thinks (reckons) it's not difficult.
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English as a Second Language
You can read my ESL story Relative Pronoun