Which word or words complete this sentence correctly? the tools were missing from the shop. a. mechanic b. mechanic has c. mechanic's d. mechanics

Shauna has collected a variety of sources for her research about charlie chaplin’s impact on american cinema. in performing her preliminary evaluation of each source, shauna should-thoroughly review and examine the content.-perform a quick search to determine the author’s reliability.-check whether the author agrees with experts on the subject.-decide whether it will be useful in her final essay.