Answer:
The correct answer is:
-ni
No puedes permitir entrar ni vendedores ni perros callejeros.
Step-by-step explanation:
- The sentence has a doble negative answer.
- when you have a negative answer use the same negative word.
- in this case the first negative answer is NI.
- The options means:
- Nunca (never)
- ni (no)
- siempre (always)
- alguien (somebody/anybody)