The correct answer is B) they adapted the Phoenician alphabet to their own language.
After the dark age of Greek civilization, the Greeks learned to write again because they adapted the Phoenician alphabet to their own language.
The Greek Dark age was the period of ancient Greece that went from the Mycenaean palatial civilization in 1100 BC and ended with the presence of the Greek city-states in the 9th century. This period is also known as the Homeric Age. After this time, the Greeks adapted the abjad system used by the Phoenicians to their own language, including some vowels sound to create their own Greek alphabet. This alphabet started to spread along the Mediterranean region when the Greeks conquered other territories.
The other options of the question were a) they discovered old scrolls left behind by the Minoans and Mycenaeans, c) they learned Sumerian cuneiform and changed it over the years, and d) the Macedonians taught then to write after they were conquered by Alexander the Great.