To find out how much less time Lamar finished his test compared to Teresa, we need to subtract the time Lamar took from the time Teresa took:
Teresa's time = 34 hours
Lamar's time = 23 hours
Calculating the difference:
\( 34 , \text{hours} - 23 , \text{hours} = 11 , \text{hours} \)
Lamar finished his test in 11 hours less than Teresa, but this option is not provided in your answer choices. Please check the values again or clarify if there is any mistake in the provided times.