B is correct because all of the verbs are in the same tense.
a.)mailed a letter to his father
Answer: Fire obstructed the doorways, so there was not prospect of escape.
Explanation:
Yes this sentence it correct, except there should not be a space between table and the period. :)
Answer:
Most mountains formed from Earth's tectonic plates smashing together. Below the ground, Earth's crust is made up of multiple tectonic plates.
Explanation:
When two tectonic plates come together, their edges can crumple thus, creating the Moutian.