Explanation:

Let’s break down each option:

- Option 1: 18 Dec

Nope, this isn’t the shortest day. The solstice never lands here.

- Option 2: 20 Dec

Close, but still not it. Sometimes people think the date shifts, but in 2020, that’s not the case.

- Option 3: 21 Dec

This one’s spot on. December 21 was the winter solstice in 2020, making it the shortest day of the year in the Northern Hemisphere.

- Option 4: 15 Dec

Too early—nights are long, but the actual shortest day hasn’t hit yet.

- Option 5: None of these

Not true, because we’ve got the right answer above.

Here’s what this really means: the winter solstice, which marks the shortest day (least sunlight), was on December 21 in 2020. If you picked option 3, you nailed it.