The correct answer is D. worried.
The verb “to worry” is used to describe the feeling of anxiety or concern about something. In this case, the speaker is saying that the woman always felt anxious or concerned about her weight when she was younger.
The other options are incorrect because they do not accurately describe the feeling of anxiety or concern. Option A, “worries,” is in the present tense, but the speaker is talking about the past. Option B, “worry,” is the infinitive form of the verb, which is not used to describe a specific action or event. Option C, “will worry,” is in the future tense, but the speaker is talking about the past.
Therefore, the correct answer is D. worried.