Which word correctly completes this sentence? estas camisetas son grandes, pero son pequeñas. aquellos aquel aquéllos aquéllas

The correct answer is answer D: aquéllas 
D is the correct answer because shirts, or camisetas are written in the feminine form! Here's the problems with the other answers: 

A: It's written in the masculine form and is missing an accent mark 
B: It is not plural! And the word camisetas is! 
C: It is written in the masculine form. 

So, the full sentence you are looking for is: 
Estas camisetas son grandes, pero aquéllas son pequeñas. 

Because it is written in the right form, it is plural, and it has an accent mark! Hope this helps you out!!!

Bruno está hablando con su hermana

Its is called el escorial. it was built in the 16th century in the town of san lorenzo de el escorial.