Cardinality between A:B is N:1 (Arrow head indicates cardinality 1)
Cardinality between B:C is 1:1
Hence Many A values can be mapped to 1 B value
For 1 B value there will be exact 1 C value
in option A)
100 A values can be mapped to 10 values in B and hence maximum value of t = 100.
10 B values can be mapped to exactly 10 C values.
Hence maximum value of t =100.
in option B)
1000 A values can be mapped to 1 value in B and hence maximum value of t = 1000.
1 B value can be mapped to exactly 1 C value.
Hence maximum value of t =1000.
in option C)
5 A values can be mapped to 3 values in B and hence maximum value of t = 5.
3 B values can be mapped to exactly 3 C values.
Hence maximum value of t =5.
in option D)
100 A values can be mapped to 10 values in B and hence maximum value of t = 100.
10 B values can be mapped to exactly 10 C values.
Hence maximum value of t =100.
Hence option D is matching only. :)
