Final answer:
The correct answer is a) Mutations in the TP53 gene. Li-Fraumeni syndrome is caused by mutations in the TP53 gene, which encodes the p53 protein, a tumor suppressor protein.
Step-by-step explanation:
The correct answer to the question is a) Mutations in the TP53 gene. Li-Fraumeni syndrome (LFS) is a rare hereditary disorder associated with a predisposition to cancer. It is caused by mutations in the TP53 gene, which encodes the p53 protein, a tumor suppressor protein. Mutations in the TP53 gene can result in the loss of p53 function and lead to uncontrolled cell proliferation and an increased risk of cancer.