Conflicting Viewpoints passage: Student A says a groundwater plume will move toward Well 1 because Well 1 has the lowest land elevation. Student B says it will move toward Well 2 because Well 2 has the lowest hydraulic head. The map shows Well 1 land elevation 140 m, hydraulic head 96 m; Well 2 land elevation 155 m, hydraulic head 88 m; the plume is between them. Which reasoning is correct?