Rearrange the parts of the sentence in correct order.
Before 1974,
P: World Bank were relatively small
Q: loans provided by the
R: the reconstruction and development

To find the correct sequence, let's connect the phrases logically:
The introductory clause is "Before 1974,".

The subject of the sentence should follow. "the reconstruction and development" (R) connects into "loans provided by the" (Q), creating the composite subject "the reconstruction and development loans provided by the World Bank".

Part P contains the main verb phrase "World Bank were relatively small".

Putting them together in the order R-Q-P:
"Before 1974, the reconstruction and development loans provided by the World Bank were relatively small."

Thus, option A is the correct arrangement.