Understanding Component Creation in React

React is a widely adopted JavaScript framework for building user interface applications. One fundamental part of this framework is the concept of 'components'. A component in React is a reusable piece of code that controls a part of the UI. Let's figure out the most valid way to create a component in react as stated in our quiz.

According to the options provided, the correct way to create a React component is:

function MyComponent() { 
  return <div/>; 
}

This sample of code demonstrates how to define a functional component in React. Functional components are JavaScript functions that accept a single 'props' object argument and return a React element.

Let's break it down further. The function MyComponent() {} is a regular JavaScript function declaration. MyComponent is the name of the function, and it is considered the name of your component, so it should start with a capital letter as per React's naming convention.

The function returns a React element <div/>. This is the simplest form of React elements created using JSX. JSX is an extension to JavaScript that enables us to write HTML-like code within JavaScript. The HTML-like syntax <div/> gets transpiled into regular JavaScript at runtime. We can even return complex JSX or other components.

Here's an enhanced example:

function MyComponent() {
  return (
    <div>
      <h1>Hello, world!</h1>
      <p>Welcome to my React component.</p>
    </div>
  );
}

In this example, MyComponent returns a larger, more complex JSX.

Regarding the other options in the quiz, they are not valid ways to create a React component. new ReactComponent(MyComponent), React.createComponent(MyComponent), and class MyComponent extends ReactElement { ... } are incorrect because they either use non-existent React APIs or use incorrect syntax.

For instance, while you can use ES6 classes to create React components, the syntax would look like this:

class MyComponent extends React.Component {
  render() {
    return <div/>;
  }
}

Note the use of the React.Component base class and the render() method.

As React evolves, many developers opt to use functional components mainly because they're easier to understand, shorter, simpler and come with perks like the ability to use React Hooks which further simplifies how you control the state and component logic.

Remember, whether you use functional components or class components, the goal is to create modular, reusable pieces of a user interface.