Karyono has audited the financial statements of PT Lestari for the year ended December 31,2007. Karyono field work was completed on February 27, 2008; Karyono's auditor's report was dated February 28,2008, and was received by the management of PT Lestari on March 5 2008. On April 4,2008 the management of PT Lestari asked that Karyono approve inclusion of this report in their annual report to stockholders, which will include unaudited financial statements for the first quarter ended March 31, 2008. Karyono approved the inclusion of the auditor's report in the annual report to stockholders. Under the circumstances,Karyono is responsible for inquiring as to subsequent events occurring though: A. February 27, 2008 B. February 28, 2008 C. March 31, 2008 D. April 4, 2008