How does a parallel circuit change when a branch is added?

1.the total resistance increases, so the current in the circuit decreases.

2.the total resistance decreases, so the current in the circuit increases.

3.the total resistance increases, so bulbs shine at a lower brightness.

4.the total resistance decreases, so bulbs shine at a higher brightness.

When a branch is added, the current from the power supply then has
one more choice of path to follow to return to the power supply.  On the
whole, then, it becomes easier for current to travel the full circuit, that's
equivalent to saying that the total resistance has decreased, and so the
total current increases.

If the power supply is able to deliver the increased demand, then the bulbs
in the existing branches are unaware of the change, and their brightness
doesn't change.

Choice-2 is the only choice that isn't at least partly wrong.

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.