Choice "B" is correct. The accountant's compilation report on a client's financial forecast should include a caveat that the prospective results may not be achieved.
Choice "d" is incorrect. The historical financial statements upon which the forecast is based need not be audited, nor must they accompany the forecast compilation.
Choice "c" is incorrect. The accountant expresses no assurance in the compilation report on forecasted statements.
Choice "a" is incorrect. A compilation of a financial forecast would not include evaluation of the support for the assumptions underlying the forecast.