Answer:
Repair Inc.
Tom may be entitled to an appraisal right if the combination is:
a purchase of substantially all of the assets of either corporation.
Explanation:
An appraisal right is Tom's right, as a dissenting stockholder, to demand appraisal and payment of the fair value of his stocks from either Repair Inc. or Service Company. Since Tom has dissented and voted against the proposed combination, the appraisal right enables Tom to withdraw and demand the payment of the fair value of his shares in either corporation.