Which statement best explains why the United States grew into a world economic power in the 20th century?
A. The United States stayed out of major world wars and instead
made economic investments.
B. The United States put effective trade barriers in place to limit trade
with other nations.
C. The United States benefited from investments in manufacturing
and technology
D. The United States prevented other countries from abandoning the
gold standard.

Afull irb committee meeting is convened and one agenda item is a new research proposal to evaluate how mothers interact with their learning-disabled child. the inclusion criteria require the children to be a minimum of five years of age. the protocol requires the mother of the child to look at the child without any expression and not to talk to the child for three minutes. the committee determined that the mother's required task may upset the child. the irb approved the study with appropriate language in the parental permission form regarding the possibility that children might become upset. after the start of the study, the principal investigator reports to the irb that, as expected, one of the children became upset. the incident was handled according to the protocol and the child is fine. what should the irb do with regard to this report?