Final answer:
The correct answer is option c) They would look like clock parts.
Step-by-step explanation:
According to the statement, if workers were observed from above the factory, they would likely resemble clock parts. The passage describes how factory workers on assembly lines lose their connection with the finished product, much like individual parts of a clock have no apparent significance on their own but function within the larger machine. The comparison to clock parts emphasizes how the workers fit into the repetitive and mechanical nature of the assembly line, without a clear vision of the final product their labor contributes to.
(Options mentioned in the statement like ants, invisible, or birds, do not match the context provided within the provided passages)