If in a code language, MOULDING is written as LNTKCHMF and MARGIN is written as LZQFHM, how will be COULD written in that code ?a.CBNTKb.BNTKCc.BNKTCd.BNTCK

The first step is to understand the pattern of the code. Let's take the first example:

MOULDING is written as LNTKCHMF

If we compare the positions of the letters in the English alphabet, we can see that each letter in the word MOULDING is shifted one position to the left. For example, M (the 13th letter) becomes L (the 12th letter), O (the 15th letter) becomes N (the 14th letter), and so on.

Now, let's apply this pattern to the word COULD:

C (the 3rd letter) becomes B (the 2nd letter) O (the 15th letter) becomes N (the 14th letter) U (the 21st letter) becomes T (the 20th letter) L (the 12th letter) becomes K (the 11th letter) D (the 4th letter) becomes C (the 3rd letter)

So, COULD is written as BNTKC in the code language. Therefore, the answer is option b. BNTKC.