Question

the 1979 calderón commission evaluated irrigation access in the lerma - chapala basin using household - level intake records. initial findings showed yield gains of 14 percent in districts receiving gated canals by 1983. ____ this increase depended on maintenance density, as sites inspected fewer than twice annually failed to sustain output gains documented in report no. 47 of the national water institute.
25
which choice completes the text with the most logical transition?
a for instance,
b accordingly,
c however,
d in sum,

Explanation:

The first part of the text presents a positive result (yield gains), and the second part introduces a condition (dependence on maintenance density) that limits or qualifies that result (sites with less maintenance failed to sustain gains). This shows a contrast. "However" is used to introduce a contrast or qualification. "For instance" is for examples, "Accordingly" for cause - effect (following from), and "In sum" for summarizing. So "However" is the most logical transition.

Answer:

C. However,