What is a characteristic of the tests of Endothyrida (Fusulinida)?

A. Multichambered and planispirally coiled throughout growth stages
B. Single-chambered and uncoiled
C. Multichambered, septate, and planispirally to streptospirally coiled at least in the early stage
D. Single-chambered and streptospirally coiled only in the late growth stage
Answer: 