Choose the best closing for a message requesting the receiver's support for a proposed change in a benefits plan.
a. we really need to implement this new benefits plan soon.
b. if you have any further questions about this new benefits plan, do not hesitate to contact me.
c. contacting me by december 1 about your support of this new benefits plan will allow me to present this proposal at the next strategic planning session.
d. e-mail me at your earliest convenience with your decision.

The business cycle is the periodic but irregular up-and-down movement in economic activity, measured by fluctuations in real gross domestic product (gdp) and other macroeconomic variables. a business cycle is typically characterized by four phases—recession, recovery, growth, and decline—that repeat themselves over time. economists note, however, that complete business cycles vary in length. the duration of business cycles can be anywhere from about two to twelve years, with most cycles averaging six years in length. some business analysts use the business cycle model and terminology to study and explain fluctuations in business inventory and other individual elements of corporate operations. but the term "business cycle" is still primarily associated with larger (industry-wide, regional, national, or even international) business trends.

I'm not 100% sure but i think it is service producing industries