If modern technology did not exist, we would never have such precious information.

Knowledge: Vocabulary

Explain:

precious (adj): precious, precious

A. confidential (adj): secret

B. detailed (adj): detailed

C. valuable (adj): valuable

D. precise (adj): exactly

=> precious (adj): precious, precious = valuable (adj): valuable

If modern technology didn’t exist, we would never have such valuable information.

Choose C.