[Solved] Find the issue in this C# code:var items = new[] {"cat", "dog", "cow"}; var grouped = items.GroupBy(); foreach (var group in grouped) { Console.WriteLine(group.Key); } | C Sharp (C#)

C Sharp (C#) - LINQ Fundamentals

Find the issue in this C# code:

var items = new[] {"cat", "dog", "cow"};
var grouped = items.GroupBy();
foreach (var group in grouped)
{
    Console.WriteLine(group.Key);
}

AGroupBy requires a key selector function

BGroupBy cannot be called on arrays

Cgroup.Key is not accessible

DMissing semicolon after GroupBy

Step-by-Step Solution

Solution:

Step 1: Check GroupBy method call
GroupBy requires a key selector lambda or delegate; calling without arguments is invalid.
Step 2: Confirm other parts
Arrays support GroupBy, group.Key is accessible, and semicolon is present.
Final Answer:
GroupBy requires a key selector function -> Option A
Quick Check:
GroupBy needs a key selector lambda [OK]

Quick Trick: Always provide a key selector to GroupBy [OK]

Common Mistakes:

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