Which process skill requires the use of the senses? a- stating opinions b-theorizing c-modeling d-observation

it is either c or d and i know for sure it is not a or b

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.