I NEED ANSWER NOW PLEASE ITS MISSING I WILL MARK U AS BRAINLESS PELASE TELLL ME HOW U GOT UR ANSWER

Answer:
It is B.
Step-by-step explanation:
Expanded form is writing a number by using multiplication or addition, and in this case we are multiplying.
Here, the number is 354.1
(3x100)=300
(5x10)=50
(4x1)=4
1x 1/10 -or- 0.1= 0.1
300+50+4+1/10=354.1
Therefore, your answer is B.