The Correct option is C. Tool that labor cannot use against management during negotiations is Lockout.
Labor Negotiations
During dispute between management and labor, the negotiations is the only way to resolve the issues. There are many tools which Labor can use during their negotiations, such as Strike, Picketing, and Boycott.
These are from normal to extreme steps Labor can choose, but there is one tool that managment can also use, this is Lockout. Lockout is opposite of strike, in strike, labor refuse to work, while in lockout, management refuses labor from working.
Therefore, the correct option is C.
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