Which alphabet will replace the question mark

Which letter replaces the question mark ?

A statement is given and a and b are assumptions related to it. Select the option that
is true with respect to the given statements.
The king has decided to levy 3% tax on the amount payable for funding drought
relief programmes.
a. The king does not have sufficient money to fund drought relief programmes.
b. The amount collected by way of surcharge may be adequate to fund these
drought relief programmes.

Select the minimum number of colours that are sufficient for colouring the areas of
the accompanying image such that there would not be same colour on the two sides
of any curve.

If A : B = 2:3, B:C = 5:4, then the ratio of A:B:C is

Which of the following number is divisible by 9