Final answer:
The correct word to complete the phrase is 'necesito', making the correct option 'Ella sabe que necesito'
Step-by-step explanation:
The word 'que' is a conjunction that means 'that' or 'what' in Spanish. In this phrase, the correct word to complete it is 'necesito', which is the first person present indicative form of the verb 'necesitar' (to need). The correct option is 'Ella sabe que necesito', which translates to 'She knows that I need'.
Learn more about Spanish verbs