The correct option is D It was so bright that it hurt my eyes.
A conjunction combines or connects two sentences as one. They can be a word or a phrase (like even if, as well as, etc). Correlative conjunctions are words in pairs that connect two sentences, but they're not written together, for example, either...or, but...and, such...that etc, where a word or a phrase is in between the pair (either rice or noodles). 'So that' and 'so...that' have different meanings. 'So that' refers to purpose, it expresses the reason for which an action is carried out, as in 'I left early so that I could attend the party'. The given sentence does not focus on purpose, but the result, where 'so' refers to the adjective 'bright' and 'that' refers to the result of it being bright "it hurt my eyes", this can be seen in B, hence option B is correct. In option A, 'so that' focuses on purpose, and changes the meaning of the sentence to 'it was bright for the reason that it could hurt my eyes', which isn't what the original sentence means, hence A is incorrect. In option C, the order of 'so...that' has been altered, where 'that' refers to the adjective 'bright' and functions as a demonstrative, but in the construction 'so...that', it's supposed to refer to the result, hence option C is incorrect. In option D, 'so bright it was' is incorrect in terms of order, where the adjective 'bright' precedes the subject 'it'. Sentences with 'so...that' do not begin with 'so', hence option D is incorrect.