There are a few big problems with (B).
First, "which enables" is a noun modifier, so it needs to modify the preceding noun. However, we want to modify AART, so this doesn't work. Even if we wanted to modify "carbon nanotubes," we would then need to say "enable" rather than "enables."
An even quicker way to spot this modifier problem is to notice that the word "which" is preceded by a semicolon. This means that the two parts of the sentence should
...
First, "which enables" is a noun modifier, so it needs to modify the preceding noun. However, we want to modify AART, so this doesn't work. Even if we wanted to modify "carbon nanotubes," we would then need to say "enable" rather than "enables."
An even quicker way to spot this modifier problem is to notice that the word "which" is preceded by a semicolon. This means that the two parts of the sentence should
...
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