How has agriculture contributed to the decline of the Chang Jiang's water quality?

A. Clearing land for farming has caused acid rain.

B. The fertilizers used by farmers contaminate the river.

C. Livestock drink from the river and spread their diseases.

D. Irrigation of farmland has reduced the water level in the river

answer; i believe the answer is 80%, plz check first good luck;

giant impact theory - the moon was formed from the collision between earth and another mars-sized body.

colliding planetesimals hypothesis - the moon was formed from the same cloud of material as earth.

capture hypothesis - the moon was locked into orbit by earths gravity as it was passing by it.

accretion hypothesis - the moon was formed from collisions and combining of planetesimals.

i think this is right, if not and you know better let me know.