Which of these is NOT a sign of former tectonic activity that has been found on Mars?

Question

Quizplus · Accepted Answer

The concept of plate tectonics, as it is understood on Earth, has not been directly observed on Mars. The long lines of dormant volcanoes marking ancient plate boundaries suggest a process similar to Earth's plate tectonics, but such evidence has not been conclusively found on Mars. The other options (Valles Marineris, interlocked magnetic fields, and remnants of global magnetism) are indeed signs of past tectonic and volcanic activity, but they do not necessarily indicate the presence of plate tectonics similar to Earth's.

Which of These Is NOT a Sign of Former Tectonic