In “...additional demand for oil could be met by nonconventional methods,” (lines 52-53) the verb form could expresses In “...additional demand for oil could be met by nonconventional methods,” (lines 52-53) the verb form could expresses

In “...additional demand for oil could be met by...

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In “...additional demand for oil could be met by nonconventional methods,” (lines 52-53) the verb form could expresses

certainty.

necessity.

possibility.

obligation.

permission.