Given the following historical data, what is the moving$-$average forecast for period $6$ based on the last three periods?

Period Value

$173$

$268$

$365$

$472$

$567$

Question $29$ options:

a$)$

$67$

b$)$

$68$

c$)$

$69$

d$)$

$100$

e$)$

$115$