C#.NET — Which statement about constructors is correct?

Introduction / Context:
Constructors in C#.NET initialize objects and set up type-level state. In addition to ordinary instance constructors, the language also supports a special kind called a static constructor, which runs once per type to initialize static members.

Given Data / Assumptions:

• The question compares several claims about what constructors can and cannot do.
• We must choose the single correct statement among common misconceptions.

Concept / Approach:
There are two broad constructor categories in C#: instance constructors (can be overloaded, can be private/protected/internal/public) and static constructors (no parameters, no access modifiers, run automatically once, and initialize static data). An instance constructor executes with an implicit this reference and can read/write both instance and static members. Static constructors have no this and can touch only static state.

Step-by-Step Solution:

Verification / Alternative check:
Compile a class with a private constructor (compiles) and with multiple overloads (compiles). Add a static constructor to set static fields (compiles and runs once at first use).

Why Other Options Are Wrong:

• A: Private constructors are legal and commonly used.
• B: Overloading is fully supported.
• D: Instance constructors can set static fields.
• E: this exists in instance constructors; only static constructors lack it.

Common Pitfalls:
Confusing static constructors (type initialization) with instance constructors (object initialization).

Final Answer:
A constructor can be a static constructor.