Answer:
The answer to your question is:
Step-by-step explanation:
A. Centromere is the section of the chromosome where two sister chromatids are held together.
B. Sister chromatid are to identical copies of the same chromosome and these structures are attached to the same chromosome by a centromere.
Centriole is not an option because these structures are use during cell division or mitosis, they help to separate the sister chromatids during cell division.
Spindle is not correct because these structures are microtubules used during the mitosis process to separe sister chromatids.