Answer: "you gave her in the morning" is an adjective clause.
It modifies or specifies which <u>pen</u>.
Explanation: If the word "that" had been included, as in
"that you gave her in the morning" it would be a relative clause; 'that' is a relative pronoun.
(In your question the "an___" is a hint that the answer starts with a vowel)
In any case, they are clauses, not phrases, because they include a subject, 'you', and a predicate, 'gave her in the morning.'
Gives the reader context to what the text will be about.
A. titles
I am pretty sure, but if I am wrong or right please tell me
Answer:
it could either be A. or C. but it is most likely A.