The difference between the highest marks in Science in two years = Highest marks in Science in one year - Highest marks in Science in another year
Solve all option one by one
Option ( A ) 1992 and 993
The difference between highest marks in Science 1992 and 993 = 89 - 88 = 1
Option ( B ) 1992 and 1996
The difference between highest marks in Science 1992 and 1996 = 92 - 88 = 4
Option ( C ) 1996 and 997
The difference between highest marks in Science 1996 and 1997 = 98 - 92 = 6
Option ( D ) 1992 and 993
The difference between highest marks in Science 1992 and 1995 = 97 - 88 = 9
The maximum difference is in the years 1992 and 1995, since the least value is in 1992 and the highest value is in 1995.
