Choice "A" is correct. Prior to commencing field work, the auditor would likely discuss with management any assistance desired from client staff. This is part of establishing an understanding with the client.
Choice "d" is incorrect. Prior to commencing field work, the auditor likely would be unaware of the specific matters to be included in the communication to those charged with governance.
Choice "c" is incorrect. While the auditor may set a preliminary measure of materiality, this is a matter of auditing judgment and would not typically be discussed with the client. In addition, significant internal control weaknesses are reported because they indicate a potential for material misstatement, regardless of whether any actual misstatements exceed a particular threshold.
Choice "b" is incorrect. Prior to commencing field work, the auditor would be unlikely to have identified inadequate controls or evaluated their possible effects.