Which of the following would be easily fossilized?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Forelimbs of humans and bats are homologous.
Reason $R$: Forelimbs of humans and bats have similar anatomical structure.
In the light of the above statements, choose the most appropriate answer from the options given below:

The common ancestry of humans and chimpanzees is best demonstrated by which of the following?

Fossils are ..........

Archaeopteryx is a connecting link between:

The age of fossils or dating of fossils can be best estimated by