一台锅炉上不宜全装双色水位表，是因为（）。

A.造价太高

B.损坏视力

C.停电时无法观察水位

An analyst does research about various companies and stocks. A company has experienced stable earnings over the previous years and the company has a high beta. These factors best describe a:

A. cyclical company and a defensive stock.
B. defensive company and a cyclical stock.
C. defensive company and a defensive stock.