B is corrent. The requirement is to identify the programmed edit check that offers the best solution for preventing the error of mistakenly entering an invalid date in a data field. A reasonableness test would not allow an invalid date to be accepted.
A is incorrect because a preformatted screen would still allow an invalid date to be inputted.
C is incorrect because a mathematical accuracy check would not detect an invalid date.
D is incorrect. On-line prompting could help but the user could still input the invalid date.
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