单选题 Blindness first began creeping up on Barbara Campbell when she was a teenager, and by her late 30s, her eye disease had stolen what was left of her sight.
Reliant (依赖于) on a talking computer for reading and a cane for navigating New York City, where she lives and works, Ms. Campbell, now 56, would have been thrilled to see something. Anything.
Now, as part of a striking experiment, she can. So far, she can detect burners on her stove when making a grilled cheese, her mirror flame, and whether her computer monitor is on.
As part of the experiment, Ms. Campbell now are able to all the following EXCEPT

• A. walking in the city without the cane.
• B. seeing her mirror flame.
• C. telling whether her computer monitor is on.
• D. detecting burners on her stov