Number (2) is (a)  

Number (3) is (a)  

Number (4) is (a)  

Number (5) is (a)  

Number (6) is (a)  

Number (7) is (a)  

Number (8) is (a)  

Number (9) is (a)  

Number (10) is (a)  

Number (11) is (a)  

Number (12) is (a)  

Number (13) is (a)  

Number (14) is (a)  

Number (15) is (a)  

Number (16) is (a)  

Number (17) is (a)  

Number (18) is (a)  

Number (19) is (a)  

Number (20) is (a)