Embarrassment, envy, anger.
There are many human relations skills which can help you to more willingly take on a challenging subject. Greater self-confidence is one of those for example.
Being more self-confident enables you to trust more in yourself and therefore to also think you can succeed better with more challenging topics in comparion to the scenario where you don't really think highly about yourself.
B. By not drinking alcohol
Its has to be C
cause D is dealing with water
now B makes sense cus because a member of a population will be affected by a diesise (definition)
and A makes 1% sense its kinda the samething as B dealing with infections
now C. deals with mesquitos
