What does this sentence mean: That's about the kind of it?

[Touchy]

English Language Tests, Intermediate level

ESL/EFL Test #706 "English Slang Idioms (448)", question 6

"So even though he was the one who cheated on her, he's going to take her to court to make sure she gets nothing out of the divorce?" Dana asked Ralph. "That's about the ......... of it," he replied.

(a) way
(b) kind
(c) size
(d) form

English Language Tests, Intermediate level

ESL/EFL Test #706 "English Slang Idioms (448)", answer 6

"So even though he was the one who cheated on her, he's going to take her to court to make sure she gets nothing out of the divorce?" Dana asked Ralph. "That's about the size of it," he replied.

Correct answer: (c) size

Your answer was: incorrect
"So even though he was the one who cheated on her, he's going to take her to court to make sure she gets nothing out of the divorce?" Dana asked Ralph. "That's about the kind of it," he replied.
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What exactly this sentence means? Praksh

[Mister Micawber]

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That's about the size of it = That's roughly correct.
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Native English teacher at Mister Micawber's