Choice "a" is correct. An exemption of $300 is available for simple
trusts.
Choice "d" is incorrect. There is no standard deduction for simple trusts.
Standard deductions are available only for individuals.
Choice "b" is incorrect. There is no deduction for brokerage commissions to
purchase tax-exempt bonds. Since the interest on tax-exempt bonds is not
taxable, related investment expenses are not deductible (by any
taxpayer).
Choice "c" is incorrect. There is no charitable contribution deduction for
simple trusts.