Which branch of science avoid or minimize stress-related injuries at workplace?

The answer is "ergonomics".

Ergonomics (or 'human factors' as it is alluded to in North America) is a branch of science that expects to find out about human capacities and confinements, and afterward apply this figuring out how to enhance individuals' connection with items, frameworks and situations.  

Ergonomics means to enhance workspaces and conditions to limit danger of damage or mischief. So as innovations change, so too does the need to guarantee that the instruments we access for work, rest and play are intended for our body's necessities.

answer: b) the us is the leading importer but not the leading exporter.

extra info:

the u.s is the largest importer but it is not the largest exporter as china sits on the top of the table when it comes to leading exporters.

but u.s is not far from first,

they rank in 2nd globally as the worlds largest exporter.

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in terms of experimental research, mcdonald’s charging different prices in the two cities relates to