The correct option is A Mrignayani's big dark blue eyes cast a spell on me.
In order to find out the right sentence, let's understand what the order of adjectives is. If we have multiple adjectives in a sentence, the order of adjectives should be this - 1. Quantity, 2. Quality, 3. Size, 4. Age, 5. Shape/type, 6. Colour, 7. Proper adjective and 8. Purpose/Qualifier. We see that this sentence has three adjectives - big - size, dark - type, and blue - colour. Hence, we can say that Option A- 'Mrignayani's big dark blue eyes cast a spell on me' is the correct answer. Options B, C, and D are incorrect as they do not follow the order of adjectives.