Correct option is B
The correct option to fill in the blank is (B) have.
Explanation: The subject of the sentence is "These people", which is a plural noun. According to the rule of Subject-Verb Agreement, a plural subject must take a plural verb. 'Have' is the plural verb used for possession in the present tense.
Example: The children have many toys.
Information Booster: 'Has' is used with singular subjects (He/She/It). 'Having' and 'Is having' are generally not used for static possession in standard English grammar.
So the correct answer is (b)