How do specific words and phrases contribute to the impact of King’s opening?

the answer is use of support  

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.

answer: (fluidity)is the correct answer.

explanation: because of this characteristic, success on the battlefield depends in large part on the ability to adapt to proactively change events to our advantage as well as to react quickly to constantly changing conditions

by 1880, germany had more rail lines than great britain and russia.