Answer:
idk what it is but I need points so.
A is used for words that begin with a consonant sound;
an is used for words that begin with a vowel sound:
What a/an exciting summer it has been for Jalia.
"exciting" is the word right after a/an, and it starts with a vowel sound (short vowel e) and is a vowel.
The answer is an => What an exciting summer it has been for Jalia.
i would think A? before taking my answer maybe wait for a second opinion :)
Answer:
B.the language as an influence on thinking for speaking position.
Explanation: