My answer is: C. At least two parallel groups of upright flowering branches used as line materials.
I based that answer from the missing data that this question had.
Oval bowl that is very large and low and has a pale gray crackled glaze. Said bowl is a bonsai container. It will be the container of the floral arrangement.
The bowl will be placed in the foyer of his business office, on a counter that will make the bowl visible in both sides. Colors in the foyer are black, white, and gray.
Customer wants an artistic arrangement that suits the bowl