Explanation:

- We need to identify vowels in the sequence that are immediately followed by a symbol.

- The sequence provided is: Q 4 N S E # K 7 Y $ C 8 3 P I T 6 % 9 H U 2 R J * V 5 W A 1 B D G.

- Begin by listing the vowels in the sequence: E, I, U, A.

- Next to each vowel, check the following character:

- E is followed by #.

- I is followed by T.

- U is followed by 2.

- A is followed by 1.

- Count vowels immediately followed by a symbol:

- Only the vowel E is followed by a symbol (#).

- Therefore, the total number of such vowels is one.

- Option:2, One is the correct answer.