Concept:Use a variable for A's share and form an equation from the total distributed amount.Explanation:Let A's share be x.B gets 17.5% more than A, so B's share is x+10017.5​x=4047​x.C gets one-third of the sum of A and B.Therefore, C's share is 31​(x+4047​x)=31​(4087​x)=12087​x.The total amount distributed is A+B+C+D=1,75,000.Substitute D=42,760: x+4047​x+12087​x+42,760=1,75,000.So x+4047​x+12087​x=1,32,240.Making denominators equal to 120 gives 120120x+141x+87x​=1,32,240.Thus, 120348​x=1,32,240, which gives x=3481,32,240×120​=45,600.So A gets ₹45,600.B's share is 4047​×45,600=53,580.C's share is 31​(45,600+53,580)=31​(99,180)=33,060.Required difference is 53,580−33,060=20,520.Answer:₹20,520, which is Option A.