In a certain code language, 'THORP' is written as 'IUNKM' and 'SERIES' is written as 'JXKTXJ'. How will 'TRACE' be written in that language?

Let us check the letters in reverse order or cross patterns.
For THORP → IUNKM:
Let's reverse the letters of THORP → P R O H T.
Now match it to the code I U N K M:

P(16)−7=I(9)

R(18)+3=U(21)

O(15)−1=N(14)

H(8)+3=K(11)

T(20)−7=M(13)

Let's see if this pattern works for SERIES → JXKTXJ:
Reverse of SERIES → S E I R E S

S(19)−9=J(10)

E(5)+19=X(24)
This pattern doesn't seem to line up simply. Let's try direct substitution or look at the alphabet positions directly.

Let's examine the letters:
T → I
H → U
O → N
R → K
P → M

In SERIES → JXKTXJ:
S → J
E → X
R → K
I → T
E → X
S → J

Notice that 'R' is coded as 'K' in both words!
We need to find the code for TRACE:

T → I

R → K

A → ?

C → ?

E → X (from SERIES)

So the code for TRACE must look like: I K _ _ X
Let's look at the options:
A) XBZKI
B) IKXBZ
C) IKBZX
D) IKBXZ

Only options B, C, and D start with IK.
Among B, C, and D, only option C ends with X (I K B Z X).

Thus, by structural confirmation from direct letter matching, the answer is Option C.