Select the correct option: The speaker’s explanation was so packed with technical jargon that it veered into __________.

The correct option is (a). The sentence means that the explanation became difficult to understand because it contained too much technical jargon. Therefore, the blank should take a noun meaning lack of clarity or obscurity. The word opacity means the quality of being opaque; figuratively, it means unclearness, obscurity, or difficulty in understanding (Hindi meaning: अस्पष्टता/दुर्बोधता). Example: The legal document’s opacity confused the readers. Why other options are incorrect: Option B: opalescent is an adjective meaning showing shifting colours like opal; it does not fit the idea of unclear explanation (Hindi meaning: ओपल जैसा चमकीला). Option C: poaceous means related to grasses; it is unrelated to the context (Hindi meaning: घास कुल से संबंधित). Option D: opaque is an adjective, while the sentence needs a noun after into; also, into opaque is grammatically incorrect (Hindi meaning: अपारदर्शी/अस्पष्ट). So the correct answer is (a)