In social science research, "highest education level attained" would refer to the most advanced grade or degree achieved by an individual-for some individuals, it may be a grade in grade school, and for other individuals, it may be a Bachelor's Degree, a Master's Degree, or Ph.D. (which is considered the highest education level). A recent study has shown a strong correlation between highest education level attained and proficiency in chess. Another result, studied at many points throughout the 20th century, shows a marked positive correlation between highest education level attained and income level. Assuming the statements above are true, what conclusion can be drawn?
【选项】If one practices chess enough to raise one's proficiency, one has a good chance of raising one's income level.