Answer:
![\boxed {\tt A. \ Tiene}](https://img.qammunity.org/2021/formulas/spanish/high-school/2ovam5tj3iv3b80175muu5j60a23xjyibp.png)
Step-by-step explanation:
The sentence is:
Mónica_____ocho años (Monica _____ eight years)
The answer choices are all conjugated forms of tener.
Monica is one person and in this sentence is a "she". We must conjugate for el/ella/usted. Tener conjugated for ella is tiene.
So, the correct answer is A. tiene.
The completed sentence is:
Mónica tiene ocho años (Monica is eight years old).