Jennifer can tune her guitar more effectively than maria, because jennifer is better at detecting whether specific strings are playing too sharp or too flat. with respect to tone sensitivity, maria apparently has a threshold than does jennifer. lower difference higher absolute lower absolute higher difference.

Higher difference

Explanation:

 According to the question, Maria is apparently has the higher threshold difference as compared to Jennifer because the Jennifer is understanding the specific string of the guitar much netter than maria.

 So, that is why the Jennifer is playing the guitar more effectively as compared the maria due understanding the tone sensitivity more efficiently. The High threshold means the noise will be generating on the random basis with the minimum stimulation.  

 Therefore, Higher difference is the correct answer.

the correct answer on edgen is:

(c.) prevent the spread of communism.

i just took the test.

world bank is the correct answer.