NEET 2005 Chemistry question

A solution of urea (mol. mass 56g ) boils at 100.18°C at the atmospheric pressure. If and for water are 1.86 and 0.512K kg respectively, the above solution will freeze at :

• (A)- 6.54° C
• (B)-65.4° C
• (C)65.4° C
• (D)- 0.654° CCorrect