Answer:
Option A, B and D are correct 
Explanation:
The given options are
 A) 1 x 45
 B ) 3 x 15
 C) 4 x 12
 D ) 5 x 9
Let us multiply
 A) 1 x 45 = 45 ( Correct ) 
 B) 3 x 15 = 45 ( Correct ) 
 C) 4 x 12 = 48 ( Not correct ) 
 D) 5 x 9 = 45 ( Correct ) 
Option A, B and D are correct