After karyogamy followed by meiosis, spores are produced exogenously in Agaricus, Saccharomyces, Neurospora, Alternaria?

In basidiomycetes, karyogamy and meiosis takes place in basidium and produce four spores exogenously. These spores are called basidiospores. For example, Agaricus. Neurospora, Saccharomyces, and Alternaria produce spores endogenously. So, the correct answer is option A.