The form nosotros means we and the verb form would end in amos because pensar is an ar verb.
The correct answer is B
You need to add the "audio" so the question can be answered.
<h3>Traduzca al español. Sara was feeling sick.</h3>
Answer : Sara se sentía enferma.
<em>Explanation : The English past continuous can translate to the imperfect past Spanish, especially in reflexive verbs as "sentirse".</em>