HELP// Find the first four terms of the sequence given [tex]a_{1} =18[/tex]and[tex]a_{n+1} =\frac{2+a_{n} }{2}[/tex]

A. 18, 10, 6, 5

B. 18, 14, 6, 9

C. 18, 10, 6, 9

D. 18, 10, 6, 4