The adverb 'boldy' means 'without fear' or 'confidently'. The adverb 'timidly' means 'in a manner that shows a lack of courage or confidence'. As the two words have opposite meanings, they are antonyms. Option A is the correct answer.
The adverb 'cleverly' means 'in an intelligent, original, or skillful way'. The adverb 'hopefully' means 'in a hopeful manner'. The adverb 'clearly' means 'without a doubt'.
As the above three words do not mean the opposite of 'body', options B, C and D are incorrect.