Answer:
C
Step-by-step explanation:
i⁰ = 1
i¹ = i = [tex]\sqrt{-1}[/tex]
i² = -1
i³ = i².i = -1.i = -1
i⁴ = i².i² = -1.-1 = 1
i⁵ = i⁴.i = 1.i = i
so, looking only i¹,i², i³, i⁴ is easier
19 / 4 = 16 + 3 => (4 x 4 ) + 3
so, we'll look i³
i³ = i².i = -1.i = -1
Hope this helps ^-^
