请教语法

calliejuUID: 2150958

请教几道语法题

１．Acrylic (paint) ( enables) artists (to experiment) with (many) colors effects.
我选d,答案 a ，请指教

２．Canadian scarlet-clad (guards) and mounties (with ) horseback are (part) of the (summer scene) in Ottawa.
我选c.答案b，请指教

３．In the US, a primary election is a method ____ voters select the nominees
for public office.
A. that  B. by which C.is that D by those
  我选Ａ，答案Ｂ，不是定语从句中，先行词是way,引导词应用ＴＨＡＴ，　ＩＮ　ＷＨＩＣＨ　或者不填嘛，ＭＥＴＨＯＤ　和ＷＡＹ　不是一个意思嘛

qq620UID: 2167239

paint; painting
with ; on
select.....by    以什么方法选