Hide option in select ios(5) - safari?

Question

css

I'm trying to hide unnecessary options in select using Jquery using pseudo-elements. Example: $('#product-1696 #pizza_sous option:nth-of-type(4)').hide(); or else like this $(".pizza-style #pizza_sous :last") and like this $(".pizza-style #pizza_testo option:nth-child(2),.pizza-style #pizza_testo option:nth-child( 3)").hide();. On the desktop in all browsers and on android everything works. But on iphone ios 5s these elements are not hidden.
What is the problem?