An essential input field that should contain data is empty. The data edit control that would detect this error is a

Innovation and Entrepreneurship activity help increase economic activity by:

a) strengthening business infrastructure b) creating new products and markets c) providing more authority to government officials d) eliminating state-run enterprises

From October 2007 to March 2009, stock prices as measured by the S&P 500 Index

A) nearly doubled in value. B) lost more than half their value. C) declined by nearly 10%. D) rose by nearly 25%.