Decoding the Letter Shift Code

The question presents a coding puzzle where the word PLANE is transformed into QMBOF. We need to identify this coding pattern and apply it to the word TRAIN.

Identifying the Pattern

Let's compare the letters of the original word 'PLANE' with its coded version 'QMBOF':

• P becomes Q
• L becomes M
• A becomes B
• N becomes O
• E becomes F

The pattern observed is that each letter in the original word is replaced by the next letter in the English alphabet. This is a consistent shift of +1 position for every letter.

We can represent this shift mathematically:

• $P \rightarrow Q$ (Position of P + 1 = Position of Q)
• $L \rightarrow M$ (Position of L + 1 = Position of M)
• $A \rightarrow B$ (Position of A + 1 = Position of B)
• $N \rightarrow O$ (Position of N + 1 = Position of O)
• $E \rightarrow F$ (Position of E + 1 = Position of F)

Applying the Pattern to TRAIN

Using the identified +1 shift rule, we now encode the word TRAIN:

• T $\rightarrow$ U (T + 1 position)
• R $\rightarrow$ S (R + 1 position)
• A $\rightarrow$ B (A + 1 position)
• I $\rightarrow$ J (I + 1 position)
• N $\rightarrow$ O (N + 1 position)

Combining these resulting letters gives the coded word USBJO.

Final Coded Word

Therefore, TRAIN is written as USBJO in this code. This corresponds to Option A.