'H' is related to 'July' in a certain way based on the above arrangement. 'B' is related to 'June' following the same pattern. "__ is related to 'May' following the same pattern.

G sits third to the right of the person who joins in May and the person who joins in August sits second to the right of G, => Let the person who joins in August sit at extreme right end. 

A and E are immediate neighbours of each other. Neither A nor E has joining dates either in May or August. Neither A nor E is an immediate neighbour of G, => A sits at the extreme left end of the row and E to its immediate right.

Only two people sit between E and the person whose joining date is in July, => The person whose joining date is in July sits to the immediate left of G. 

Only one person sits between E and B, => B sits between the persons having joining dates in May and July. 

E joins after April and joins neither in May, July (because of gap of 2 persons) or August, => E joins in June.

H sits third to the right of the person whose joining date is in January, => B joins in January, and H sits to the immediate right of G. 

The person whose joining date is in February sits to the immediate left of D, => D sits at the extreme right end.

C joins on one of the months before July and G joins after A, => C joins in May A joins in March and thus G in April.

'H' is related to 'July' : H sits 2nd to the right of person who joins in July 

'B' is related to 'June' : B sits 2nd to the right of person who joins in June

Similarly,  F sits 2nd to the right of person who joins in May, thus "F is related to 'May'.

=> Ans - (A)