Ahypothesis or group of related hypotheses that have been confirmed through repeated scientific experiments is known as a(n):
a fact.
b theory.
c experiment.
d phenomenon.

b.  theory

Explanation:

Theory -

It is the piece of information , which is given on the basis of various facts , experiments and data , is referred to as a theory.  

Publishing a theory require a lot of research and knowledge about the certain topic , so as to provide true and authentic information .

Hence, from the information given in the question,  

The correct term is theory.

the correct answer is 2.

a slump in geology means a mass movement process of slope failure. a mass of rock or unconsolidated material drops along a slip surface. in other words, rock layers move a short distance down the slope. the slump block is an intact block (2), without any landslide material.

in this image, 1 is the surface of rapture (scarp), 2 the slump block, 3 main scarp (crown), 4 base of rapture with debris flow.

slumps are caused by clear cutting on unstable soils and the sagging of earth, in coastal areas they are due to wave infiltration.