Pluto is no longer considered to be a planet. therefore there are planets in the solar system.
a. 8
c. 11
b. 10
d. 12

a. 8

Explanation:

Solar System is gravitationally bound system of the star, known as the Sun and the various objects which orbit the Sun, either indirectly or directly.

Previously, the scientist believe that there are 9 planets in the Solar system which are:

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto.

But later studies showed that Pluto is not a planet and instead it is considered to be a dwarf planet. Thus, scientist concluded that there are only 8 planets in the Solar system.

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explanation:

a, c, d, e are all applying about success strategies.