Answer: B. as flirtatious and naive.
In the lines from Robert Brownings's "My last Duchess", the speaker is describing its subject as flirtatious and naive. He explains that her 'heart is too soon made glad' and 'too easily impressed'; 'she liked whate'er', which shows her naivety ; also, he says her 'looks went everywhere', infering that she is flirtatious.