The correct option is the first one “This week,” Kamala’s music teacher said, “practice pages 45 and 46.”
When including a direct quote in a text, it should be inside quotation marks. If it is the start of a complete sentence, it goes with capital letter as in "This week," but then if it is not from the beginning, the quotation is not capitalized as in “practice pages 45 and 46.”
Option 2 is incorrect since the second part of the quotation is with capital letter.
Option 3 is also incorrect since the common noun "teacher" is capitalized when it shouln't.
