here the meaning of the word blot is given as an ink mark satisfying the option 4 but the correct one is 2 . even i thought of marking 2 as the answer but i remembered the difference between blot v/s spot. So there are 2 right answers for this question or any one of 2 and 4 ?

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The sentence in option 4 is using the word correctly.
You can either "discover a spot of ink on your collar" or "discover a blot on your collar". Yes, "blot" would be more precise but the current sentence is not wrong.
The sentence in option 2 is clearly wrong. What does "spot on his career?" even refer to?
To be more precise .....Does this mean that the phrase 'spot of ink' = the word 'blot'?
Yep!