Explanation:

Let’s break this down, step by step.

- The words are: UMF, TRE, QPO, VIR, GAT.

- Operation: Replace the first and last letters of each word with their alphabetical successors.

Let’s process each one:

- UMF:

U ? V, M stays, F ? G ? VMG

- TRE:

T ? U, R stays, E ? F ? URF

- QPO:

Q ? R, P stays, O ? P ? RPP

- VIR:

V ? W, I stays, R ? S ? WIS

- GAT:

G ? H, A stays, T ? U ? HAU

Now, let’s count how many words have at least one vowel (A, E, I, O, U):

- VMG: No vowels

- URF: U

- RPP: No vowels

- WIS: I

- HAU: A and U

Let’s tally that up:

URF (1), WIS (2), HAU (3)

That’s three words.

Option:2 (Three)