Which of the following is most likely the root word of travel.

a. trav

c. French

b. vacation

d. there is no way of knowing

I believe the answer to be d. there is no way of knowing because with the bit of research i did, 'a. trav-" did not seem like the likely answer, and b. or c. are not part of the word travel at all. So, i believe d. would be the answer through the series of elimination.