SweatyRocksWomen's 3/4 Sleeve Mock Neck Basic Loose T-Shirt Elegant Top

I'm 5'10 and 147 pounds, what size should I get?

why two different collars? one t-shirt style and the other a high boat neck type? I want the high boat neck, which color comes with boat neck?

What kind of yellow is this? Like bright yellow or like mustard ?

Is this product mashince washable? And can I put it in the dryer?