Answer:
B). Future Progressive.
Explanation:
Future progressive tense is described as the verb form that functions to express or signify a 'continuing or going on action' at some point in future. It primarily functions to indicate or demonstrate a future action or event.
As per the question, the bold or highlighted verb form 'will be volunteering' would be categorized as 'future progressive tense' as it signifies a continuing action that 'Jameson' will be doing in a particular point in future(summer). Thus, option B is the correct answer.
