In C#, which access modifier allows a member to be accessed only within the same class?

The correct answer is A: private. The 'private' access modifier restricts access to members within the same class only. It is the most restrictive access level in C#.

In C#, which interface is used to implement custom iteration logic?

The correct answer is A: IEnumerable. IEnumerable interface in C# is used to provide iteration capability through the GetEnumerator() method.

Which LINQ method is used to convert a Dictionary to a List of key-value pairs?

The correct answer is B: ToList(). ToList() converts the Dictionary's KeyValuePair enumeration into a List. ToArray() would create an array instead.

Which namespace in C# contains the collections like List, Dictionary, and Queue?

The correct answer is A: System.Collections.Generic. System.Collections.Generic is the standard namespace for generic collections in C#. It provides type-safe collections that prevent runtime errors.

Which LINQ method combines multiple sequences into a single result with cartesian product?

The correct answer is B: SelectMany(). SelectMany() (also called flatMap in other languages) flattens nested sequences and creates a cartesian product of collections.