Select the most appropriate option to fill in blank number 4.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. backed up.
The sentence says, "more than one scientific study has ______ its effectiveness."
The correct phrase is "backed up," which means supported or confirmed.
So, "backed up" fits perfectly here to show that studies have supported the idea of retail therapy’s effectiveness.