Which sentence combines these two sentences and includes a relative clause? the car stopped running today. the car was reliable for over 20 years.
the car stopped running today even though it was reliable for over 20 years.
the car that stopped running today was reliable for over 20 years.
the car stopped running today; it was reliable for over 20 years.
the car was reliable for over 20 years, but it stopped running today.

The car that stopped running today was reliable for over 20 years.

Explanation:

A relative clause is a group of words with a subject and a verb that tells us more about a noun, that is, acting as an adjective. These relative clauses can be defining (when it gives essential information about a noun) or non-defining (when it does not give essential information about a noun and is set off by commas).

The sentence “The car that stopped running today was reliable for over 20 years” is the one that combines the two sentences and includes a relative clause, which it's “that stopped running today.” This clause gives us essential information about the car (a noun), therefore it is a defining relative clause.

the right ones are in bold.

daintly refers to the fact she was reaching for what she ate, not necessarily what she is like.

greatest charm as in she possessed (=had) the greatest charm.

pleasant (her demeanor)

speaking (of her sensibility)

dead refers to the hypothetical mouse.

bleeding refers to the hypothetical mouse.

it is the background information on the characters and setting explained at the beginning of the story. the exposition will often have information about events that happened before the story began. the exposition is often the very first part of the plot.