C. is. the correct answer
please let me know if you have any questions about how i answered this question please:)
Exercise 1:
an ocean
a pebble
an insect
a bug
a web
an archaeologist
an eagle
a geologist
a fossil
an ancient fossil
You only change "a" to "an" when the next word starts with a vowel.
Answer: Women; 10
Explanation: I found this question on a quizlet