In the sentence “While playing the tuba, Orin felt as if his world was perfect,” Is “playing the tuba” a gerund phrase or a present participial phrase?

im just here for the points

explanation:

1 - a

2 - a

3 - c

4 - b

5 - d

there is a sequence and logical steps to give an answer of a trouble.

1) strategy is necessary to develop an project idea.

2) to study and know the environment where you are going to work ( ecosystem).

3)   the materials resources to built the ideas.

4) to give a priority order in the context that you study. in this case human needs.