Identify all chiral centers in each molecule and determine whether each molecule is chiral or achiral. If the achiral molecules are meso, classify them as such.

A) Molecule 1:
i. Chiral centers: 2
ii. Chirality: Chiral

B) Molecule 2:
i. Chiral centers: 1
ii. Chirality: Chiral

C) Molecule 3:
i. Chiral centers: 0
ii. Chirality: Achiral (meso)

D) Molecule 4:
i. Chiral centers: 3
ii. Chirality: Chiral