I need more details on the subject you’re taking.
Piensa would be the correct answer since Marsha is the same as saying él/ella/usted, and for -ar verbs the conjugation for third person is -a
The answer is Tiene. Hope this helps:)
Answer:
Factor that can increase the negative effects of risk conditions and depend on the domestic and external resources that each adolescent has. It can involve, although not always, weakness or fragility.
Explanation: