Walking is not the most exciting form of exercise a person can take on for fitness. Yet it is low impact and requires no fancy equipment. That makes walking a simple activity for those new to exercise. Walking is less likely than other exercises to cause injury to leg tendons and muscles. All it requires is a good pair of sneakers—no cables, stylish outfits, or weights required. Of course, a person could increase the benefit of a workout by adding weights or speed walking.

Which of the following lists represents text evidence pieces that all support the main idea in this paragraph? (5 points)

a
Walking is fun to do, less likely to cause injury, requires good sneakers.
b
Walking is easy to start, not worth the time for fit people, needs weights.
c
Walking is not exciting, needs weights to make it beneficial, safest exercise.
d
Walking is low impact, requires no fancy equipment, less likely to cause injury.