Answer:
B. He used the wrong expression to represent the area of the base of the pyramid.
Step-by-step explanation:
Given
See attachment for pyramid

Required
Vikram's error
The surface area of a square pyramid is:

Where




So:


By comparing the calculated expression with

Option (b) is correct
Answer:
Let me take 2,3,3 be 2x, 3x, 3x
Colin = 2x
Natasha = 3x
Angad = 3x
The equation forms to find out the value of x
2x + 3x + 3x = 48
=> 8x = 48
=> x = 48/8
=> x = 6
So share of Colin = 2x = £(2×6) = £12
Share of Natasha = 3x = £(3×6) = £18
share of Angad = 3x = £(3×6) = £18
For proof
£12 + £18 + £18 = £48
Hope it helps
Not enough info, its part c of a question that has more to go off of