Correct option is B. 1 and 2 only
The Researchers found a small correlation
between cosmic rays and global temperatures
occurring every 22 years; however, the changing
cosmic ray rate lagged behind the change in
temperatures by between one and two years,
suggesting that the cause might not be down to
cosmic rays and cloud formation but might be due
to the direct effects of the sun. By comparing the
small oscillations in the cosmic ray rate, which were
taken from data from two neutron monitors, and temperature with the overall trends in both since
1955, the research team found that less than 14 per
cent of the global warming seen during this period
could be attributable to solar activity.