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Vagotomy is the correct procedure for decreasing gastric secretions. This surgical technique involves resecting portions of the vagus nerve, which innervates the stomach and stimulates gastric acid production. By cutting the vagus nerve, the secretion of gastric acid is reduced, which can be beneficial in treating conditions such as peptic ulcers, where excessive acid secretion can exacerbate the problem.

Pyloroplasty, Billroth I, and gastrostomy have different indications and do not primarily focus on reducing gastric secretions. Pyloroplasty is a procedure that facilitates gastric drainage by enlarging the opening of the pylorus. Billroth I is a surgical procedure used to remove the lower part of the stomach and connect the remaining part to the duodenum, while gastrostomy involves creating an opening into the stomach for feeding, rather than altering secretion levels. Thus, while these procedures might have roles in surgical interventions involving the stomach, they do not specifically aim to decrease gastric secretions like vagotomy does.