Korean: Learn "이다" and "그들"

What does "이다" mean in English?

• A.in
• B.but
• C.the (f)
• D.to be

Translate to Korean: "they (m)"

• A.하지만
• B.그들
• C.그녀들
• D.나

Translate to Korean: "this"

• A.저
• B.이
• C.없이
• D.이다