Which word in the sentence does the underlined phrase modify?

under the beach umbrella, marcella relaxed on a colorful

towel.

a. relaxed

b. towel

c. colorful

d. marcella

D. Marcella

The phrase adds an idea where the noun “Marcella” is resting. Therefore it answers the question “where”. This is an example of prepositional phrase which functions as an adjective. 

what is your question because all i see is "i'll give 25p. and give brainliest.

may i see the historical information and the excerpt?