I dont' know about 3.x but on 4.0.7 I believe it is modules/Product_Options/product_options.tpl. If that's not it then check the others in that same folder.
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X-Cart Version: 4.0.17
Linux 2.4.21-37.ELsmp
Apache 1.3.34
MySQL 4.0.25-standard
PHP 4.4.1
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