Is the group of words a simple sentence, a compound sentence, or a run-on sentence?

this is very hard that is much softer.

a.
compound sentence

b.
run-on sentence

c.
simple sentence

is the group of words a simple sentence, a compound sentence, or a run-on sentence?

grasslands are a biome they include pampas, steppes, and prairies.

a.
run-on sentence

b.
simple sentence

c.
compound sentence

is the group of words a simple sentence, a compound sentence, or a run-on sentence?

the ledge was narrow, but one person could stand on it.

a.
run-on sentence

b.
compound sentence

c.
simple sentence

is the group of words a simple sentence, a compound sentence, or a run-on sentence?

these are very colorful those are very plain.

a.
compound sentence

b.
simple sentence

c.
run-on sentence

is the group of words a simple sentence, a compound sentence, or a run-on sentence?

logan bought a guitar, took lessons twice a week, and played in a concert.

a.
run-on sentence

b.
simple sentence

c.
compound sentence

is the group of words a simple sentence, a compound sentence, or a run-on sentence?

the museum was crowded, but our group was able to see everything.

a.
compound sentence

b.
simple sentence

c.
run-on sentence

is the group of words a simple sentence, a compound sentence, or a run-on sentence?

the murmur of the waves, the feel of the sand, and the warmth of the sun are all very relaxing.

a.
compound sentence

b.
run-on sentence

c.
simple sentence

is the group of words a simple sentence, a compound sentence, or a run-on sentence?

the rain poured down, but we stayed warm and dry.

a.
simple sentence

b.
run-on sentence

c.
compound sentence

is the group of words a simple sentence, a compound sentence, or a run-on sentence?

the bustle of the airport, the sight of the airplanes, and the sound of the engines all make me want to fly.

a.
simple sentence

b.
compound sentence

c.
run-on sentence