If metals are deposited in streambeds _____ would probably be used.

Question

If metals are deposited in streambeds _____ would probably be used.

A. placer mining

B. strip mining

C. underground mining

D. spoil bank mining

E. open-pit mining.

Answer 1

I will chose B

Answer 2

Placer mining. (Not at all related to open-pit mining.) See linked article.

Uses a sluice box with ridges along the bottom where the heavier metals settle out as the water washes the stream bed material through.

EDIT:

Just looked at the other answerer's reference, and it does claim that placer mining is related to open-pit mining, which is wrong. Strip mining and open-pit mining are closely related, but neither is similar to placer mining. (see the 2nd link)