Asap! anne franke questions. which character is described as being "mercurial"?

anne.
peter .
margot .
mrs. van daan.

why are the characters wearing several layers of clothing when they arrive at their hiding place?

it is wintertime so the weather is cold.
they know that the secret annex does not have heat.
they would look suspicious if they carried suitcases.
they were in a hurry and did not have time to pack properly.