door when a wrinkledand when they begin questioning you

The old farmer’s eyes still shone bright in the wrinkled brown face and his step as he came across the room was ________, though slow. A．shaky B．heavy C．casual D．steady

英语翻译
She was a small woman,old and wrinkled.When she started washing for us,she was already past seventy.Most Jewish women of her age were sickly and weak.All the old women in our street had bent backs and leaned on sticks when they walked.But this washwoman small and thin as she was,possessed a strength that came from generations of peasant forebears.Mother would count out to her a bundle of laundry that had accumulated over several weeks.She would then lift the bundle,put it on her narrow shoulders,and carry it the long way home.
She would bring the laundry back about two weeks later.My mother had never been so pleased with any washwoman.Yet she charged no more than the others.She was a real find.Mother always had her money ready,because it was too far for the old woman to come a second time.

SAT阅读：这句话怎么理解
A dog's noseis to ours as the wrinkled surface of our complex brain is to the surface of an egg.