“amounts of +不可数名词”作主语谓语动词用复数，但“amount of +不可数名词”作主语谓语动词用单数。例如：
The amount of the bill is ＄100. 账单总额是100美元。（《英汉双解当代美国英语学习词典》p.40）
Large amounts of money  were spent on the bridge. ( 赵振才编著《英语常见问题解答大词典》增订版 p.96)
所以下面一题答案是B：
The amounts of money being lost by the company ______ enough to make it a metaphor for an industry that was teetering.
A. was B. were