Which of the following planets is the smallest? a. uranus b. venus c. neptune d. saturn

Venus.

Explanation:

The order of size of planets is:

Jupiter : more than 1000 % of size of earth.

Saturn : nearly 950% of the size of Earth

Uranus : nearly 400% of the size of Earth

Neptune : nearly  390% of the size of Earth

Earth : our planet.

Venus : less than 95% of the size of Earth

Mars : less than 55% of the size of Earth

Mercury : less than 40% of the size of Earth.

Thus out of given planets the size order will be:

Saturn> Uranus> Neptune> Venus.