Explanation
The word, 'grubby', is an adjective which means 'covered with dirt/grimy'. The word, 'muddy', is an adjective which means 'covered in or full of mud'. Anything covered in mud is dirty. As both the words have a similar meaning, option C is correct.
The word, 'new', is an adjective which refers 'to something which is just made/ bought It refers to something which did not exist before'. Something which is 'new' is not grubby/ dirty.
The word, 'wet', is an adjective which means 'covered or saturated with water or another liquid'. Something which is wet is not necessarily dirty/ grubby.
The word, 'hygienic', is an adjective which means 'clean, especially in order to prevent a disease'. Something which is hygienic is not grubby/ dirty.
As all the above three words are quite different in meaning from the word, 'grubby', options A, B and D are incorrect.
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