Why did ancient Egyptians initially use mathematics? A.
to distribute food among different civilians
B.
to count the civilian population in each village
C.
to collect taxes from farmers and tradespeople
D.
to plan their annual agricultural activities

I think it might be the fourth option (D)

Explanation:

In ancient Egypt mathematics was used for measuring time, straight lines, the level of the Nile floodings, calculating areas of land, counting money, working out taxes and cooking. Maths was even used in mythology - the Egyptians figured out the numbers of days in the year with their calendar.

2 is armenia i think

2018 means 2018 ce or common era

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