For a short call position, the risk factors include:

• Delta: Sensitivity to underlying price changes
• Vega: Sensitivity to volatility changes
• Gamma: Sensitivity to delta changes (second-order price sensitivity)
• Rho: Sensitivity to interest rate changes

Theta (time decay) is not considered a risk factor for short positions since time decay generally benefits short option positions.

Therefore, Delta, Vega, Gamma, and Rho all contribute to the risk of a short call position.