what is it mean by C#

Question

B b = new B();
A a = b;

Answer 1

declares a B as b. Assigns a new B to b
see here: https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/new-operator

declare a A as a. assigns b to it.

Answer 2

c sharp? or do you mean what is new

Answer 3

what did he here I mean