Final answer:
Applying Gram-Schmidt to an orthogonal set of vectors does not return the vectors unchanged. The statement is false. So the correct answer is Option A.
Step-by-step explanation:
The statement is false. When applying the Gram-Schmidt process to an orthogonal set of vectors, the resulting vectors will not be the same as the original vectors. The Gram-Schmidt process is used to orthogonalize a set of vectors, which means the resulting vectors will be orthogonal to each other but not necessarily the same as the original vectors.