A socioeconomic status is a measure based on the combined economical and societal characteristics as work experience and family's position in relation to others. It is meant to classify someone into a high, middle, or low economical status.
It's not a division, it's categorization. Considering the explanation above, it is not specifically about one's ability to create wealth and it's not based on birth.
The option that fits the explanation is:
2.a stratification based on income. job, and education