Reared in a village where computers and the internet were objects of curiosity, Purty today hardly gives a thought to the immense possibilities that the internet revolution has thrown open to him.

In its current form (Option A), the sentence seems grammatically correct and conveys the intended meaning. It clearly states that the person was raised in a village where computers and the internet were considered objects of curiosity.

Contrarily, the remaining choices are either awkwardly phrased or unidiomatic. For example, in Option B, "reared up" is not a standard phrase, and "curious to know that" changes the meaning of the original sentence. Option C has a tense error: it uses "are" instead of "were," which is inconsistent with the past tense of the sentence. Additionally, "being reared" is less concise and slightly odd. Option D is incorrect because "an object of curiousness" is not idiomatic.

Hence, Option A is the correct choice.