Final answer:
The correct verb form is 'tenía'.
Step-by-step explanation:
The correct verb form that completes the sentence is tenía.
'Ella tenía miedo de viajar' translates to 'She was afraid to travel'. Here, 'tenía' is the past tense form of the verb 'tener' (to have), which is used to indicate possession or states of being.
An example sentence to illustrate the use of 'tenía' would be: 'Yo tenía una mascota cuando era joven' (I had a pet when I was young).
Learn more about Verb forms in Spanish