A general building (Class B) contractor takes a contract that involves only a single specialty trade. Under California law, the Class B contractor must:

Explanation

§7057(a) defines the general building contractor by the structure and by the requirement that its construction use at least two unrelated building trades. §7057(b) supplies the rule this question turns on: a Class B may take a prime contract or a subcontract for framing or carpentry, but shall not take a prime contract for any project involving other trades unless the prime contract requires at least two unrelated trades other than framing and carpentry, or unless the Class B holds the appropriate licence classification itself or subcontracts with an appropriately licensed contractor. A single-trade job fails the two-trade test, which is why (b) is wrong. (c) misreads the ladder: Class A is general engineering under §7056, a separate classification with its own experience requirement, and holding it would not license the specialty trade either. (d) overshoots, because the contract is perfectly available by either route the statute names — and §7059(a) lets the licensee add the C classification without a further licence fee.