Here is where you can thank yourself for reading things that aren’t entirely academic or GRE-focused: billboards, ads in the subway, the taglines on TV commercials. If you’ve seen ads for plastic surgery “augmentation” before, you know that it means to enhance or make larger. So for this new vehicle to add to or enhance the company’s lineup, the choice here is augment. For the other answers, to feature the lineup would be to showcase it or advertise it. To mollify something is to appease it or calm it down. To obviate is to hinder or prevent. And to ascertain is to determine or figure out.