Which key concept did charles i agree to in the petition of rights (1628). a. no parliament
b. no hereditary monarchy
c. no taxation without representation
d. no state religion

The correct answer is C. No taxation without representation

Explanation

The Petition of rights of 1628 was an important constitutional document in England in which specific  "rights" were set, in this document specific restrictions were declared as these restrictions could not be infringed by the king or any person against common people. This was the result of conflicts between the parliament and the king and included restrictions for the taxation of non-parliament or no taxation without representation, the use of martial law or unfair imprisonments. This document did not modify monarchy, parliament or religion but somehow limited the power of them and give people some "rights" or protection, including taxes.

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).

there were abundant sources of fuel nearby