Since necklaces are made of 10 beads each, group the given number of beads in 10 and the left out beads as loose beads.
Razia- 12 = 10 + 2 = 1 ten + 2 ones
Reema- 17 = 10 + 7 = 1 ten + 7 ones
Aarif- 24 = 20 + 4 = 2 tens + 4 ones
Sonu- 35 = 30 + 5 = 3 tens + 5 ones
Simar- 31 = 30 + 1 = 3 tens + 1 one
Tens are the number of necklaces, and ones are the number of loose beads. Therefore, the correct answer is: