Which clastic sedimentary rock is made of the smallest grains? 1) Conglomerate
2) sandstone
3) siltstone
4) shale

Shale

Shale has the smallest grain size. Shale is made mostly of clay-sized particles and hardened mud.

Explanation:

thank me later

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.