Allusion
Allusion is a figure of speech, in which an object or circumstance from unrelated context is referred to covertly or indirectly
To most of my research so far, it is the visual of speech sounds. When you look through a dictionary, you'll usually see these things under the main word you're looking for.
For example, you take a word like "Seahorse". You have the word type, and below the word type, you see some fancy looking text.
I will bold this mini dictionary bit for you to show you what we're focusing on.
Seahorse
Noun
/ˈsēhôrs/
The text in bold here is what you're looking for when you want to find the "Phonetic Transcription." Hope this helps!
I believe the answer is D. The birth rate in India is greater than in china.
This is because of the "one-child policy" that's enforced in China.