请选择CBA/c,R(v6@5v5G0u-f3@'{+] It was ______ egg. Now it is a caterpillar.2e2v.C:{3H5D0j)U;Z:O,[*Q
A. a2e2v.C:{3H5D0j)U;Z:O,[*Q
B. an2e2v.C:{3H5D0j)U;Z:O,[*Q
C. the2e2v.C:{3H5D0j)U;Z:O,[*Q