The correct answer is C. dishonest dealings.
Sharp practices are dishonest or unethical business practices. They can include things like price gouging, false advertising, and insider trading. People who engage in sharp practices are often motivated by greed or a desire to get ahead at all costs. They may believe that they can get away with their actions because they are smarter or more clever than others. However, sharp practices can have serious consequences for both the individuals who engage in them and the businesses they work for. They can damage reputations, lead to legal problems, and even result in criminal charges.
Extreme hard work, keen business skills, and sharp intelligence are all admirable qualities, but they are not the same as sharp practices. Someone who works hard and has a keen business sense may be able to build a successful business without resorting to dishonest or unethical behavior. In fact, doing so is likely to be more sustainable in the long run.
It is important to be aware of the risks associated with sharp practices and to avoid them whenever possible. If you are ever unsure about whether a particular business practice is ethical, it is always best to err on the side of caution.