Answer:
$130,000
Step-by-step explanation:
Since Jim and Peggy owned the house as community property, at Jim's death the property rights pass directly to Peggy, so she owns 100% of the house.
When one spouse dies, section 1014(b)(6) establishes that community property assets step up 100% to match fair market value. In this case, the basis for the house will increase from $90,000 to $130,000.