In this sentence, does the period go inside or outside the quotation marks?

Question

In the following sentence, does the period go inside or outside the quotation marks?

He was known as "that kid whose parents went missing."

Answer 1

Kimberly,

In American English, the period goes inside the quotation marks since it's part of the quote.

Jacob

Answer 2

The period goes inside the quotation marks.

Answer 3

I believe this sentence should be as follows,

He was known as "That kid whose parents went missing."

The period goes inside the quotation because it is part of the quotation.