Select the most appropriate option to fill in blank number 3.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. estimate.
- The word "estimate" is the most suitable option for blank number 3.
- The sentence talks about the difficulty in determining the true value of the services people provide.
- "Estimate" in this context means to assess or approximate the value of something, which aligns well with the idea of determining the value of services that people offer.