Final answer:
The appropriate form of the verb 'ser' in the given sentence is 'soy.',
Step-by-step explanation:
In this sentence, we need to fill in the blank with the appropriate form of the verb 'ser' (to be) to complete the statement 'Es verdad que yo _______ de Argentina.' The correct form is 'soy' which means 'am' in English. So, the correct answer is OD. soy.
Learn more about Use of the verb 'ser' in Spanish