The point of this exercise is that of practicing your Bode plot sketching skills.
Part a) Look for simplifications in the transfer function; the information given on the relative magnitude of the parameters of the circuit will allow you to place poles and zeros in the diagram.
Part b) Here you just have to make a substitution! Note that with the information given, you can find all the numerical coefficients of the transfer function.
Part c) Not much harder than Part a).