Correct option is A
Solution:
Here are the basic symbols:
I: 1
V: 5
X: 10
L: 50
C: 100
D: 500
M: 1000
Now,
By option (a)
M > D > C > L > X
Option (a) follow.
By option (b)
X > M > C > D > L
Option (b) not follow.
By option (c)
D > M > C > L > X
Option (c) not follow.
By option (d)
M > C > D > L > X
Option (d) not follow.