Upgrading to a solid-state drive (SSD) provides more storage space and faster read/write speeds, which resolves both the "insufficient storage" error and slow application loads. * Option B (USB): Not intended for permanent application storage or performance improvements. * Option C (HDD): Could solve storage capacity but would not improve speed. * Option D (RAM): Affects multitasking and memory-intensive tasks, not storage capacity directly. CompTIA A+ Core 1 Exam Objective Reference: * Objective 3.5: Given a scenario, troubleshoot problems related to storage devices.