What caused the flying pig to move in a circle, the vertical component of the tension, the horizontal component of the tension, the weight, or a mysterious unknown thing called the centripetal force?

The centripetal force

Explanation:
Refer to the diagram shown below.

T =  the tension in the rope
m =  the mass of the flying pig
v =  the tangential velocity of the pig
r =  the radius of the circular motion
F =  the centripetal force

The centripetal force is due to the centripetal acceleration of 
a = v²/r.

Therefore the pig flies in dynamic equilibrium under the action of the three forces:
mg, the weight of the pig
T, the tension in the rope
F = (mv²)/r, the centripetal force

Answer is c because in exothermic reactions, energy releases.in cellular respiration,atp+h20 (water) = adp+ pi + energyso celullar respiration is exothermic and releases energy

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