[7] Mr. Smith, a cash-basis, calendar-year taxpayer, owns a duplex. He lives in one unit and rents the other unit to an unrelated individual. The two units are approximately equal in size. On July 1, Year 1, Mr. Smith paid the property insurance on the duplex for the 3-year period July 1, Year 1, through June 30, Year 4. The total premium was $360. For Year 1, Mr. Smith's rental expense for this insurance policy is

A. $30 B. $60 C. $120 D. $360