It's all of them :)
<span>Parliament would choose who ruled the country
The ruler would be subject to parliament laws
The ruler could not proclaim or suspend any law
The ruler could not impose taxes
The ruler could not maintain an army in peacetime without parliaments consent
Parliament would meet at leased once a year
The ruler could not interfere with the election of Parliament's members</span>
A.) Diseases and infections
I believe the answer is A) Businesses sell goods and services in product markets.