Answer:
pongo
Step-by-step explanation:
We see that the subject is "yo", so we need a verb that is conjugated appropriately.
Look at the answer choices:
B. "Pones" is the conjugation for the "tu" form (because the ending is -es), so it's wrong
C. "Pone" is the conjugation for the "el/ella/usted" form (because the ending is -e), so it's wrong
Only A works. Poner is an irregular verb, so its "yo" form is not "pono" but "pongo".
Thus, A is the answer.
Hope this helps!