In JavaScript, there is only one numeric type for ordinary numbers: number.

JavaScript number is a double-precision 64-bit binary format (IEEE 754).

There is no separate float, double, or decimal type in core JavaScript.

So:

typeof pi === ' number ' ;

Hence, the correct answer is:

A. Number

Options B, C, D are specific numeric types found in other languages (like C, Java, C#), not distinct types in JavaScript.

Study Guide Concepts:

JavaScript primitive types

typeof operator and number

Lack of separate float / double / decimal types in JS