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Dear student,
Since the lagging strand (read in 5' to 3' direction) DNA replication is a discontinuous one, it requires an additional enzyme, DNA ligase in order to seal the small strands. These fragments called Okazaki fragments are joined using DNA ligase, which is not needed in leading strand (read in 3' to 5' direction) DNA replication.
Hence 2nd option is the correct answer.
Regards
Since the lagging strand (read in 5' to 3' direction) DNA replication is a discontinuous one, it requires an additional enzyme, DNA ligase in order to seal the small strands. These fragments called Okazaki fragments are joined using DNA ligase, which is not needed in leading strand (read in 3' to 5' direction) DNA replication.
Hence 2nd option is the correct answer.
Regards