In call options, it's the exact opposite: buyers of the call option have the right to buy stock at the strike price. (money.stackexchange.com)
The buyer of a call has the right to buy a stock at a set price until the option contract expires. (fidelity.com)
Call options are tradable securities that give the buyer of the call options the right to buy stock at a certain price («strike price») on or before a certain date («expiration date»). (borntosell.com)