Identify Time Series and Cross Sections

Identify time series and cross sections.
-A locally owned spa, Alexander's, is interested in adding a tea room that not only
Offers specialty teas but an organic lunch menu. In order to determine how many of its
Regular customers would be interested in such an addition, Alexander's sent out a short e-
Mail questionnaire. One question asked its customers to indicate how much they spend
Monthly on all natural, organic products. These data are

A) cross-sectional.
B) time series.
C) categorical.
D) transactional.
E) experimental.