Homonyms refer to the word which is pronounced and spelled similar with the other word(s) but is different in meaning.
As in the above options, a choice which is a pair of homonyms is b. Blue, blew
Here, Blue refers to the color whereas, blew is the past of blow, which refers to an act of motion of the wind or air.
D is the correct answer :)
The correct answer is C. recognition of.
In order to thoroughly appreciate something, first of all you need to have a particular knowledge about the subject. Then you need to observe it thoughtfully and come to your own conclusion. In the end, you need to recognize its value, regardless of whether you like it or not.