I believe the answer is d but it could also be b
The answer is D I got a 100% on the unit review
Answer:
Princely states of Pakistan in order of accession
Amarkot.
Bahawalpur.
Khairpur.
Chitral.
Swat.
Hunza.
Nagar.
Amb.
Light bulbs were the power source used in factories during the industrialization