Final answer:
Without specific information on the glide slope or approach chart for the KROA GPS Runway 34, or a descent planning tool, an exact descent rate cannot be determined. Pilots use approach plates and avionic systems to determine the required descent rate for specific approaches.
Step-by-step explanation:
The rate of descent that should be planned to establish the glide path for a specific approach at an airport. When flying an aircraft, descent rate can often be calculated using the approach's glide slope, but if this information is not directly provided, rules of thumb or descent planning tools are used instead. Since the question does not provide the glide slope angle or descent rate calculation tools for KROA GPS Runway 34, and since it's a multiple-choice question, students are expected to have been provided with information or formulas to arrive at one of the provided choices in their aviation studies materials.
In real-world aviation, this rate of descent would typically depend on the glide slope for the approach, which could often be around 3 degrees translating to roughly a 5-to-1 ratio of horizontal to vertical distance traveled. At 140 knots groundspeed, this would roughly translate to a descent rate of about 700-800 feet per minute. However, without specific information on the glide slope, the approach chart for the GPS Rwy 34 at KROA, or a formula relating groundspeed to descent rate, the exact answer cannot be determined from the information provided.