Understanding the Coding Pattern

This question involves a coding-decoding pattern based on the positions of letters in the English alphabet. We are given that the word VIRUS is coded as WJSVT. Let's analyze the relationship between the letters of VIRUS and WJSVT.

We can observe the change from each letter of VIRUS to the corresponding letter in WJSVT:

• V goes to W
• I goes to J
• R goes to S
• U goes to V
• S goes to T

Looking at the alphabetical order, we see that each letter in WJSVT is exactly one position ahead of the corresponding letter in VIRUS. This is a simple shift cipher where each letter is shifted forward by 1 position (+1) in the alphabet.

Let's verify this with the letter positions:

• V is the 22nd letter, W is the 23rd letter (22 + 1 = 23)
• I is the 9th letter, J is the 10th letter (9 + 1 = 10)
• R is the 18th letter, S is the 19th letter (18 + 1 = 19)
• U is the 21st letter, V is the 22nd letter (21 + 1 = 22)
• S is the 19th letter, T is the 20th letter (19 + 1 = 20)

The pattern is consistently a +1 shift for each letter.

Applying the Coding Rule to BACTERIA

Now, we need to apply the same +1 shift rule to each letter of the word BACTERIA to find its coded form.

• For B: Shift +1 > C
• For A: Shift +1 > B
• For C: Shift +1 > D
• For T: Shift +1 > U
• For E: Shift +1 > F
• For R: Shift +1 > S
• For I: Shift +1 > J
• For A: Shift +1 > B

Putting these shifted letters together, the coded word for BACTERIA is CBDUFSJB.

Comparing with the Options

Let's compare our coded word CBDUFSJB with the given options:

1. ABDUFSJB
2. CBDUFTJB
3. CBDVFSJB
4. CBDUFSJB

Our derived coded word, CBDUFSJB, matches option 4 exactly.