Step 1: Understand the task.
We must find the word that means 'a collection of selected writings'.
Step 2: Find the meaning of 'anthology'.
An anthology is a book that gathers selected poems, stories, or other writings, often from many authors, into one collection.
Step 3: Match the clue to the word.
The clue 'collection of selected writings' fits exactly with the meaning of 'anthology'.
Step 4: Check the other options.
'Anthropology' is the study of humans and cultures. 'Archaeology' is the study of ancient remains. 'Astrology' deals with stars and their supposed effect on people. None of these mean a collection of writings.
Step 5: Avoid the trap.
'Anthropology' looks and sounds close to 'anthology', but its meaning is quite different. We must not mix them up.
Step 6: State the conclusion.
A collection of selected writings is called an anthology.
\[ \boxed{\text{Anthology}} \]