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A is corrent because the professional standards state that an attorney may appropriately limit his response to matters to which he has given substantive attention in the form of legal consultation or representation.
B is incorrect because the attorney must reply to matters, regardless of whether the probable resolution will be detrimental to the client.
C is incorrect because the attorney is not exempt from responding to legal matters subject to unsettled points of law, uncorroborated information, or other complex judgments.
D is incorrect because, in addition to replying to asserted claims and pending litigation, the attorney is obligated to reply to questions about unasserted claims and assessments.