It would be the last choice (D.) because:
There was total of 30 years of history covered by the Acts of the Apostles.
Not as many as you might think; less than 25
It covers 30 years of history.
The actual value varies, but most people generally agree that it covers from about 29 A.D. to about 64 A.D., meaning that it covers around 35 years worth of history.
Acts covers the period from approximately 33AD to 62AD.
