Which of the following is the correct order?

To compare the decimal fractions easily, let us balance the number of digits after the decimal point by adding placeholder zeros:
* $2.002\to 2.0020$
* $2.02\to 2.0200$
* $2.2\to 2.2000$
* $2.222\to 2.2220$

Arranging these values in increasing (ascending) order:

$$2.0020<2.0200<2.2000<2.2220$$

Thus, the correct relational sequence is:

$$2.002<2.02<2.2<2.222$$