Final answer:
The first syllable in the word "present" is stressed in sentence C, when it's used as a noun meaning a gift.
Step-by-step explanation:
In these sentences, the first syllable in the word "present" is stressed in sentence C: "I was so happy with the wonderful present I got for my birthday." When "present" is used as a noun, meaning a gift, the first syllable is stressed (PRE-sent). However, when "present" is used as a verb, meaning to show or give something, the second syllable is stressed (pre-SENT), as seen in sentences A, B, and D. Sentence C is the only one using "present" as a noun.