New techniques in thermal-scanning photography, a process that records radiation from surface areas,makes it possible to study the effects of calefaction, or warming, of a river in greater detail than ever before.
(A) makes it possible to study the effects of calefaction, or warming, of a river in greater detail than ever before
-"makes" = incorrect b/c you're talking about plural subject (techniques), so the verb tense should be "make" instead
(B) make it possible to study,
...
(A) makes it possible to study the effects of calefaction, or warming, of a river in greater detail than ever before
-"makes" = incorrect b/c you're talking about plural subject (techniques), so the verb tense should be "make" instead
(B) make it possible to study,
...
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