Creo que los avances científicos no deben tener restricciones. Creo que no deben tener restricciones por que si tienen restricciones, nunca descubriremos cosas nuevas.
Explanation:
I believe that scientific advances should not be restricted. I think they should not have restrictions because if they have restrictions, we will never discover new things.
your missing one of the answers because B. un instrumento de viento is a wind instrument, C. Un instrumento de aire is an air instrument and D. un instrumento de cuerda is a string instrument, so your missing Answer A
