In the "Improve" phase of the Engineering Design Process, engineers typically focus on evaluating the prototype and making necessary adjustments based on testing and feedback. Therefore, the most relevant options are:
B - Try and evaluate the prototype.
D - Redesign the prototype as needed.
Both B and D are essential activities in the Improve phase. However, if you need to select only one, B is the first step, followed by D, which encompasses the improvements made after evaluation.