For the top Section A, leave this blank since you're not reporting transactions related to a trust.
For Section B, yes, you will indicate individual.
For Section C, you are correct to leave that blank.
You are again correct that you fill in the last box in that top section "You are a U.S. person who, during the current tax year, received certain gifts or bequests from a foreign person."
You will then skip to the last page, Section IV.
In the case of the cash being transferred from your sister, simply enter the date of the transfer, "cash" as description, and the amount.
Be sure to sign and date the form where indicated, then mail to:
Internal Revenue Service
PO BOX 409101
Ogden, UT 84409
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