How did planetesmals form planets?

A. They broke apart into smaller chunks.
B. They collided and stuck together.
C. They cooled and pulled ice together.
D. They began to rotate.
Is the answer B? Thank you so much in advance.

here are the answer u guys 100%

1.B
2.C
3.B
4.C
5.B
6.A
7.D
8.The small inner planets (Mercury, Venus, Earth, and Mars) are composed mostly of silicate rocks and metals; the outer planets (Jupiter, Saturn, Uranus, and Neptune) are much larger, consist mostly of gaseous hydrogen and helium and ice, and have large systems of icy moons.

9.The small inner planets (Mercury, Venus, Earth, and Mars) are composed mostly of silicate rocks and metals; the outer planets (Jupiter, Saturn, Uranus, and Neptune) are much larger, consist mostly of gaseous hydrogen and helium and ice, and have large systems of icy moons.

u are welcome
o and if i am wrong on some of them u may correct me do not get mad at me but i do think these are right.

1.b

2.c
3.b
4.c
5.b
6.a
7.d
8. the outer planets (Jupiter, Saturn, Uranus, and Neptune) are much larger, consist mostly of gaseous hydrogen and helium and ice, and have large systems of icy moons.
9..The small inner planets (Mercury, Venus, Earth, and Mars) are composed mostly of silicate rocks and metals; the outer planets (Jupiter, Saturn, Uranus, and Neptune) are much larger, consist mostly of gaseous hydrogen and helium and ice, and have large systems of icy moons.
2019 all is 100% correct

o and i hope u guys have a great day

Is ☝ right?

Pikachu and Loading... are right for the multiple choice, but the word problem only answers #9. They answered #9 twice. #8 for me is "Explain why the outer planets did not lose the lighter gases in their atmoshperes."

loading is right for the multiple choice don't do word for word on the last two I got 100% and I go to connexues

loading is 100% right.

trust me

Hi Katty! Had this question before, you are 100% correct :)

Any other questions, I'll be glad to check ;)

Here's my answer for #8:

The outer planets have more mass and gravity than the inner planets, giving them enough strength to hold the light gaseous molecules in their atmospheres.

Yep, the answer is B!