9514 1404 393
Answer:
1/5
Step-by-step explanation:
1 kg = 1000 g so your ratio is ...

B at most 3 times
2 3/4 - 1 1/4 = 1 1/2
1 1/2 ÷ 1/2 = 3
used 1/2 ounce 3 times
so I'd say the answer is b at most 3 times because he couldn't have used it more than 3 times