How can you modify a calendar page selector to work for all dates in 2020, but only 2020?

The selection of the option that specifies the use of a calendar page selector for all dates in 2020 is grounded in how the title attribute is structured. By including the asterisk followed by the year "2020," the selector effectively matches any date within that specific year while maintaining the requirement that the year must be exactly 2020.

The asterisk serves as a wildcard, which means it allows for any day or month combination to be accepted, as long as the year specified is precisely 2020. This is crucial for ensuring that no other years are included in the selection process. The use of "2020" directly attaches the filter to that year, which fully satisfies the requirement of limiting the calendar page selector strictly to dates within that year.

Other options either allow for a range of dates, potentially including years outside of 2020, or do not correctly specify the exact year needed. Thus, the choice encapsulates the intended functionality correctly, focusing exclusively on dates from January 1 to December 31, 2020.