The price of gas increases, but Bob keeps buying gas, despite the price increase. Would his demand be considered elastic or inelastic?

it would be d). more resources must be obtained to attain that combination of goods and services

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."

permafrost layer, it exists beneath a layer of soil, rock or sediment.

answer; self-serving bias;