The correct option is
B 2 & 3
Look at these lines in the last but one paragraph -
“The fact that we can never know whether a “mature” physical theory, one which seems to leave nothing to be desired, may not be entirely off the mark is, representationalists say, no reason to deprive ourselves of the notion of “being off the mark”. To think otherwise, they add, is to be “verificationist,” undesirably anthropocentric in the same way in which nineteenth-century idealism was undesirably anthropocentric. It is to fall under the influence of what Thomas Nagel calls “a significant strain of idealism in contemporary philosophy, according to which what there is and how things are cannot go beyond what we could in principle think about”.
Look at these lines in the last but one paragraph -
“The fact that we can never know whether a “mature” physical theory, one which seems to leave nothing to be desired, may not be entirely off the mark is, representationalists say, no reason to deprive ourselves of the notion of “being off the mark”. To think otherwise, they add, is to be “verificationist,” undesirably anthropocentric in the same way in which nineteenth-century idealism was undesirably anthropocentric. It is to fall under the influence of what Thomas Nagel calls “a significant strain of idealism in contemporary philosophy, according to which what there is and how things are cannot go beyond what we could in principle think about”.
The things we can definitely infer are:
1) They were definitely against representationalists. Look at the transition word “To think otherwise” w.r.t. to the representationalists.
2) These people wanted idealism in contemporary philosophy.
So statement no.2 and 3 (as per the question are true).Statement no.1 is not supported whereas statement no.4 is contrary to the views of the verificationist.
So the answer is (b).