It would be “más grandes que” because if it were to be “menos grandes que” , it means less bigger than . The other answer choices don’t make since therefore, the answer is “más grandes que” hope this helps!
Answer: Vosotros or Ustedes.
Explanation: This is formal for <em>you all</em> in Spain. If you are from Latin America ustedes is you all with no distinction between formal and informal.