Concept:
ASCII (American Standard Code for Information Interchange) assigns a unique decimal value to every character used in computers.
Some important ASCII values are:
\[
\text{Space} = 32
\]
\[
'0' = 48
\]
\[
'A' = 65
\]
\[
'a' = 97
\]
Also,
\[
97-65=32
\]
Thus lowercase letters have ASCII values exactly 32 greater than their corresponding uppercase letters.
Step 1: Match character 'A'.
The ASCII value of capital A is:
\[
65
\]
Therefore,
\[
a \rightarrow (iii)
\]
Step 2: Match character 'a'.
The ASCII value of lowercase a is:
\[
97
\]
Since
\[
97-65=32
\]
it differs from uppercase A by 32.
Therefore,
\[
b \rightarrow (iv)
\]
Step 3: Match character '0'.
The ASCII value of zero is:
\[
48
\]
Therefore,
\[
c \rightarrow (ii)
\]
Step 4: Match the space character.
The ASCII value of a blank space is:
\[
32
\]
Therefore,
\[
d \rightarrow (i)
\]
Step 5: Write the complete matching.
\[
a \rightarrow iii
\]
\[
b \rightarrow iv
\]
\[
c \rightarrow ii
\]
\[
d \rightarrow i
\]
Hence, the correct option is:
\[
\boxed{(D)\ a-iii,\ b-iv,\ c-ii,\ d-i}
\]