Answer:
i would say photograph and telegraph
Explanation:
B.)The caste system is the correct answer
Charlemagne or also anmed as Charles the Great (2 April 742 – 28 January 814) was proclamied the new “emperor of the Romans” by pope Leo lll in the year 800.
Pope Leo III crowned this Frankish king in the year 800 and amde him the most powerfull ruler of his time.
The primary aim of the concept of balance of power in Europe during the 19th century was to
prevent domination by any one country
hope this helps.