The correct option is D Courage
A synonym is a word that is similar in meaning to another.
The given word 'valour' means 'great courage required to face danger', for example, 'He was given an award for his act of valour during the war.'.
From the options, 'courage' means the same: strength and bravery to deal with a difficult or dangerous situation. The sentence 'He was given an award for his bravery during the war' means the same as the previous sentence. Hence option C is correct.
'Cowardice' refers to the lack of bravery, whereas 'valour' is the presence of it. Hence option A is incorrect.
'Wise' is a quality that means 'having knowledge, experience and good judgment'. It is not related to 'valour.' Hence option B is incorrect.
'Beautiful' is an aesthetic quality that makes something attractive and pleasing to look at. Hence option D is incorrect.