choose the correct option

Explanation

The correct answer is Option B: 'A number of our offices are now located in suburban malls.' The phrase 'a number of' implies a plural subject, which necessitates the use of a plural verb, hence 'are' is appropriate here. Options A, C, and D all incorrectly use singular verb forms ('is', 'was', 'has'), which do not agree with the plural subject indicated by 'a number of'. Additionally, Options C and D misalign with the present tense context, as they use past and present perfect constructions respectively, which are not suitable for the given statement.