Viet Cong forces used underground tunnels to hide, communicate, and transport supplies. So, for the given question, alternatives (b) and (d) apply.
<h3>What role did the underground tunnels play?</h3>
Viet Cong soldiers used the tunnels as battle hideouts, as well as communication and supply channels, hospitals, food and weapon stockpiles, and residential accommodations for a large number of North Vietnamese fighters.
As a result, "the tunnels shielded the Vietcong from American bombs and prevented American planes from spotting Vietcong bases."
Check out the link below to learn more about Vietcong's tunnel;
brainly.com/question/14339123
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