13PUNTOSS ESPARA HOY:(
La centralización del poder político, realizado por la Corona española en el siglo XVI con Carlos I, tenía un firme obstáculo en las colonias debido A) a los encomenderos. B) a los gobernantes. C) a los intendentes. D) a los corregidores.

Not pretty sure of what you´re trying to achieve here.

Explanation: I will assume that this is an incomplete question or sentence, and therefore, we´re going to take this as a grammar issue.

Let´s stay as pro as we can.

First of all, if you´re writing a text/sentence without any intention of being "formal", then apostrophes are allowed. BUT, if you´re writing something of formal nature then you have to do it all the way long (they are instead of they're) Sounds picky, right? Most of us ignore this kind of details, and with all reason.

And the comas! Please don´t forget the comas:

THERE ARE HOLDING PICTURES OF THEIR CHILDREN, BECAUSE THEIR CHILDREN