Two pure lines of four-o'clock plants, one with red flowers and the other with white flowers, are crossed. The F1 progeny all are pink. When these are selfed, the F2 progeny are 25 percent red flowers, 50 percent pink flowers, and 25 percent white flowers. This is an example of.

Explanation:

As given here;

Two pure line of four-o'clock plant, one having red flower and other having white flower, when they are crossed, they produce all pink progeny.

So, lets red as RR and white as rr

Cross between RR and rr

Here all offspring are Rr ( Pink ).

It's the result of incomplete dominance, in complete dominance the offspring is the intermediate of both the parents.

F2 generation:

As cross between Rr and Rr

progeny are: RR, Rr, Rr, rr

RR =red

Rr= pink

rr= white

So,  red: pink: white = 25:50:25

the answer is c. it will give up it's valence electron to the other atom.