Context: The multitude of Middle Iranian languages and peoples indicate that great linguistic diversity must have existed among the ancient speakers of Iranian languages. Of that variety of languages/dialects, direct evidence of only two have survived. These are:

Question: What characteristic of Middle Iranian civilization is shown by the number of different languages and their speakers?
Answer: linguistic diversity

Question: How many of the Middlie Iranian tongues have remained in existence since ancient time?
Answer: two

Question: What characteristic of middle Iranian civilization is shown by the limited number of languages and speakers?
Answer: Unanswerable

Question: How many middle Iranian languages are still spoken today?
Answer: Unanswerable

Question: What languages were spoken by a limited number of people?
Answer: Unanswerable