Explanation

A limit order is classified as an execution instruction because it specifies how an order should be executed in terms of price.

Key Concepts:

1. Execution Instructions: These specify how an order should be executed in terms of price and timing. Common examples include:

   • Limit orders: Specify the maximum price to pay (for buy orders) or minimum price to accept (for sell orders)
   • Market orders: Execute immediately at the best available price
   • Stop orders: Become market orders when a specified price is reached

2. Validity Instructions: These specify when an order should be executed in terms of time. Examples include:

   • Day orders (valid only for the trading day)
   • Good-till-cancelled orders
   • Immediate-or-cancel orders
   • Fill-or-kill orders

3. Clearing Instructions: These specify how the trade should be settled and cleared, including details about the clearing house and settlement accounts.

Why Option C is Correct:

A limit order directly controls the execution price of the trade, which is the core function of execution instructions. It tells the broker at what price level to execute the trade, making it fundamentally different from validity instructions (which control timing) and clearing instructions (which control settlement).

CFA Curriculum Context:

This question tests knowledge of order types and their classification, which is covered in the Equity Investments section of the CFA curriculum under market microstructure and trading mechanisms.