Answer:
Option B
Explanation:
The patterns followed by the letters are :
1st letter : $G+3 \rightarrow J, J+3 \rightarrow M, M+3\rightarrow P, P+3\rightarrow S$
3rd letter : $T-2 \rightarrow R, R-2 \rightarrow P, P-2 \rightarrow N, N-2 \rightarrow L$
The number-series 4, 10, 20, 43, 90 should follow the pattern x2 +1, x2+2, x2+3, x2+4.
So, 10 is wrong and must be replaced by (4 x 2 + 1) ie., 9.
Thus, the term J10R does not fit in the given series. The correct term is J9R.