Final answer:
Deleting an old file increases storage space on a computer's hard drive, not RAM, CPU, or graphics card.
Step-by-step explanation:
When you delete an old file from your computer to free up space, the hardware component that gains more storage is the hard drive. Both Random Access Memory (RAM) and the Central Processing Unit (CPU) are involved with processing and do not store personal data files. The graphics card, mainly responsible for rendering images, also does not serve as a storage device for files such as documents, photos, or videos. It's the hard drive, or solid-state drive (SSD) in some computers, where data is stored long-term and can be freed up by deleting files.