Discussion

Explanation:

The sentence following the first blank reads as ‘humans are not to process information as quickly … they tend not to think’ in short the model is not applicable to the way human’s reason. Hence, the word has a negative connotation. Firstly, obviously and apparently therefore do not fit. The word has to be ‘regrettably’. Apparently and obviously are also synonyms. To use one would be similar as to use the other.
Hence, the correct answer is option 1.

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