Answer:
B. accidental.
Step-by-step explanation:
The discovery in the given scenario was accidental. The story of discovering coffee beans by Kaldi dates back to 800 CE.
Most of the discoveries and inventions are called serendipity. The discovery of coffee beans by Kaldi was serendipity because it was discovered accidentally when his goats ate berries and were full of energy.
After the discovery the word spread throughout Ethiopia and to the Arabian peninsula.
Therefore, option B is correct.