Step 1: Understanding the Concept:
Analyze the relationship between the word and its code. Since we are given a code (SLTMFNB) and asked for the original word, we must reverse the pattern.
Step 2: Detailed Explanation:
M (-1) $\to$ L
A (+1) $\to$ B
C (-1) $\to$ B
H (+1) $\to$ I
The pattern for Word $\to$ Code is (-1, +1, -1, +1...).
Step 3: Calculation:
To get Code $\to$ Word, apply (+1, -1, +1, -1...):
S (+1) $\to$ T
L (-1) $\to$ K
T (+1) $\to$ U
M (-1) $\to$ L
F (+1) $\to$ G
N (-1) $\to$ M
B (+1) $\to$ C
Word: TKULGMC.
Step 4: Final Answer:
The original word is TKULGMC. Thus, the correct option is (b).