Answer:
B
Explanation:
using the addition identity for sine
sin(A + B) = sinAcosB + cosAsinB
using the sine and cosine ratios in the right triangle
sinABC =
=
=

cosABC =
=
=

using the exact values
sin60° =
, cos60° =

Then
sin(ABC + 60)
= sinABC cos60 + cosABC sin60
= (
×
) + (
×
)
=
+

=
+
