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I've got a character with the ability to shape shift into any animal. I've got everything else squared away, but I'm wondering about mass. If the character turns into a creature larger than what the character normally is do I add their original mass (rank 2 for humans) to the larger form, or do I strictly go by the mass granted by the Growth power modifer necessary for the form. So I'm asking is it

A: Mass Rank 2+(Growth Modifier)= 2+X

or

B: Growth Modifier=X

Increase your mass rank by your Growth rank.

According to the Heroes Handbook, p110, the Growth power effect adds your Growth rank to your original mass rank:

Each rank of Growth adds 1 rank to your Strength and
Stamina (constructs add 1 rank to Strength and Tough-
ness if they lack Stamina) and adds 1 rank to your mass.

If your original mass is rank 2, and Growth rank is X, then using your Growth power means your new mass is rank 2+X.

In addition to Mike Q's answer, a common way of building characters who are more more massive, even if not really that much larger, is using Feature to add Mass on a 1 for 1 basis. For example, Jabroniville built both Pink Pearl and his hippopotamus build with two additional ranks of Mass.