An example of serious poaching problems is the diminishing population of Tigers.
For example in India, this has severely affected the survival-probability of tigers. There were 20000 Tigers in India in the 20th century, and now there are only 3000. This shows the severity of the problem. The government is now taking serious steps against the poachers.
Antlions experience competition when they are still larvae and looking for food or prey intake. It is called the shadow competition in where the pits are located in the upstream that can block the path of the prey thus the ones in the downstream will have less prey intake.
Either A or C, however I lean towards C more.
D is obviously not the correct answer as Social Media is typically fairly biased while B is able to be edited by the public.
Hope this helps!
C, its good to have a proper resource