The tone or pitch of the voice ; the modulation of the voice.
Answer:
Answer A
Explanation:
None of the rest of them seem really bad so I would go with this one.
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.