Which of the following is the best example of an
investment in Human Resources?

These are the following ways : i) By investment in human capital. ii) By spending resources on education and health for all. iii) By training of industrial and agricultural workers in the use of modern technology.

Explanation:

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abu bakr, was a senior companion and—through his daughter aisha—a father-in-law of the islamic prophet muhammad. abu bakr became the first openly declared muslim outside muhammad's family. abu bakr served as a trusted advisor to muhammad.

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.