Explain Why a Deep ITM Call Option Has a Delta Close to 1

A deep In-the-Money (ITM) call option has a Delta close to 1 because its price movement almost perfectly mirrors the movement of the underlying asset. The option is so far ITM that its intrinsic value is high, and the probability of it expiring OTM is negligible.

Therefore, for every $1 change in the underlying price, the option's price also changes by nearly $1, acting almost like a synthetic long position in the underlying asset.