Question

it is made of capacitors and transistors, and must be refreshed every 10 - 100ms. it is slower and cheaper than sram. options: dynamic rom, dynamic ram, ssd, eprom

Explanation:

Dynamic RAM (DRAM) is constructed with capacitors and transistors, requires periodic refreshing every 10-100ms, and is slower and less expensive compared to SRAM. ROM (including EPROM) is non-volatile and does not need refreshing, while SSDs are solid-state storage devices, not the type of volatile memory described.

Answer:

B. Dynamic RAM