What phase of program planning is the execution of the plan?
a. evaluation
b. development
c. implementation
d. none of the above.

Implementation phase

Explanation:

The Implementation phase is the phase that involves the actual execution of the work that is the work starts to be done on the ground or site.

The Evaluation is the phase involving the estimation, planning and calculations.

Development phase deals with the tasks related to the arrangement and planning of the things required for the implementation of the work.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.