Concept:Each letter is assigned a fixed digit, and repeated letters get the same digit.Explanation:
T
O
A
S
R
I
G
D
0
3
2
1
4
5
7
9
From "TOAST" → "03210": T=0, O=3, A=2, S=1.From "RIGID" → "45759": R=4, I=5, G=7, D=9.For "DOOR": D=9, O=3, O=3, R=4.Thus, "DOOR" is coded as "9334".Answer:"DOOR" is written as 9334​, which is option B.