Improve the bracketed part of the sentence.
The dog (tended with) her wounds by licking them.
The correct answer is option 1.
The phrase ‘tended to’ means administering care and attention towards something. Options 2 and 3 use either incorrect prepositions or words which are grammatical misfits. The phrase ‘tended to’ $must be used in that particular format and since the dog is licking her wounds and administering care, the correct option must be option 1. Thus the sentence becomes – ‘The dog tended to $her wounds by licking them’.