Linear Seating Arrangement of Six Persons

Let's check the given conditions against each option:

1. D is the first one in the row (all options start with D).
2. C is to the immediate left of B (i.e. 'C, B' pair).
   • (A) has B, C $\implies$ incorrect.
   • (B) has C, B $\implies$ valid.
   • (C) has C, B $\implies$ valid.
   • (D) has C, B $\implies$ valid.
3. Two persons sit between C and G.
   • In (B): D, C, B, H, G, E $\implies$ between C and G are B, H (2 persons). Valid.
   • In (C): D, G, H, E, C, B $\implies$ between G and C are H, E (2 persons). Valid.
   • In (D): D, G, E, H, C, B $\implies$ between G and C are E, H (2 persons). Valid.
4. C and H are not sitting together.
   • In (B): C is next to D and B $\implies$ C, H not together. Valid.
   • In (C): C is next to E and B $\implies$ C, H not together. Valid.
   • In (D): H is next to C $\implies$ C, H are together $\implies$ invalid.

Therefore, arrangements (B) & (C) are correct.