100 point and brainiest to correct answer with explanation!
a main reason why president johnson refused to order a full-scale invasion of north vietnam was his fear that it would:

a) bring china to war.
b) horrify the american republic, running him politically.
c) result in the loss of american lives.
d) strengthen the north veitnamese will fight.

A) bring China to war.

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.

credit card number 4 is the right answer