Which of the following is closest in meaning to the phrase "looking up" (Line 1, Para. 2)

A．to give an objective account of the e-nose
B．to question the wide use of the e-nose
C．to discuss the advantages of the e-nose over the human nose
D．to encourage the introduction of the e-nose to the market at a lower price

A．the artificial noses are even better than the human noses
B．it has not taken long for the artificial noses to be introduced to the market
C．the attempts of the artificial noses to imitate the olfactory abilities have been largely unsuccessful
D．the artificial noses have their own advantages over the human noses