Pythagoras conducted his acoustical experiments after hearing.

and

intervals coming from a blacksmith shop.

O

A loud and soft

B. consonant and dissonant

O

O C. large and small

O D. major and minor

consonant and dissonant

Explanation:

The legend says Pythagoras passed by the blacksmith shop and heard the slamming of the hammers. He realized that, when stuck simultaneously, they produce consonance and dissonance.

Consonance and dissonance are intervals that are produced by simultaneous or consecutive sounds.

Consonance is the harmony that is pleasant and sounds that are compatible. Dissonance is a name for disharmony of the sound, the tension, and harshness that sound bad.

The legend of Pythagoras says that he noticed that these hammers sometimes produce a good sound - consonance - when they hit together, and sometimes they are in disharmony - dissonance.

Hammers A and B together where producing consonance, and so were A and C, but B and C produced dissonance with each other.

Answer: Consonant and dissonant is 100% the answer.