Question

which best explains why a scientific idea would lack scientific consensus?
it is already a law
it is a new idea
it is not accepted by the public
it is not published in an encyclopedia

Explanation:

Scientific consensus is widespread agreement among scientists. A new idea may lack it as there hasn't been enough time for research, testing, and acceptance by the scientific community. Laws have already achieved a high - level of acceptance. Public acceptance is different from scientific consensus. Not being in an encyclopedia doesn't determine scientific consensus.

Answer:

It is a new idea