The fourth option is correct.
A, definitely. the encomcienda.
In english it is very common for vowells to be silent, or ignored. usually this is because they are making another vowell make a sound but this isn't always the case. Some example words could be Giraffe (e is silent) and Rules (the e makes the u make a sound but if it weren't for english rules, could be taken out.) Business also works (we don't say the i)
