The answer is C because at the beginning it talks about the different countries in the world and in the the answer C it says mundo which means world. Also it mentions la dieta mediterránea.
In English, it would be "turn age on March 26th".
So it would probably be, you will turn __ on March 26th.
1) dia would have the missing accent
2) "yamo" is llamo because "ll" makes a "y" sound
3) not sure
4) my teacher says that in spanish you don't need to capitalize the beginning of a sentence, so probably "yo" , "como" and "eres"